Medicine – Osteomalacia and Rickets

Osteomalacia and rickets are metabolic bone disorders caused by defective mineralisation of newly formed osteoid. The fundamental abnormality is failure to adequately deposit calcium and phosphate crystals into the organic bone matrix.

The terminology depends mainly on whether the growth plates are still open:

Osteomalacia → defective mineralisation in adults after epiphyseal closure.

Rickets → defective mineralisation in children before epiphyseal closure, involving both bone and the growth plates.

The most important cause worldwide is vitamin D deficiency, although disorders of calcium, phosphate and renal tubular handling can produce the same fundamental defect.

1. Normal Bone Mineralisation

Osteoblasts first produce an organic bone matrix called:

Osteoid.

This matrix is subsequently mineralised predominantly with crystals containing:

Calcium + phosphate, mainly as hydroxyapatite.

Therefore normal bone formation requires adequate availability of:

Calcium.

Phosphate.

Vitamin D.

and normal renal, gastrointestinal and hormonal regulation of these minerals.

2. What Happens in Osteomalacia?

In osteomalacia, osteoblasts continue to produce:

Osteoid,

but the osteoid is inadequately mineralised.

Therefore:

Osteoid formation

↓

Insufficient Ca²⁺/PO₄³⁻ available for mineralisation

↓

Failure of normal hydroxyapatite deposition

↓

Accumulation of:

Unmineralised osteoid

↓

Soft, mechanically weak bone.

This causes:

Bone pain, muscle weakness, deformity and insufficiency fractures.

3. Osteomalacia Versus Osteoporosis

This distinction is extremely important.

In:

OSTEOMALACIA

there is:

Defective mineralisation of bone.

The bone is inadequately hardened.

In:

OSTEOPOROSIS

there is:

Reduced quantity of normally mineralised bone.

Therefore:

OSTEOMALACIA = poor mineralisation.

OSTEOPOROSIS = reduced bone mass.

Both can cause fractures, but their underlying pathology and biochemical patterns are different.

4. Rickets

Rickets is the childhood counterpart of osteomalacia.

Because children have open growth plates, defective mineralisation affects both:

Newly formed bone

and

Growth-plate cartilage.

This produces characteristic skeletal deformities that are generally not seen in adults with osteomalacia.

5. Major Causes

The original notes identify three major groups:

Vitamin D deficiency.

Abnormal calcium/mineral metabolism.

Proximal renal tubular disease.

A more complete modern classification includes disorders causing deficiency or impaired action of:

Vitamin D, calcium or phosphate.

6. Vitamin D Deficiency

The most important cause is:

Vitamin D deficiency.

Vitamin D is essential for maintaining adequate intestinal absorption of:

Calcium

and

Phosphate.

Therefore deficiency can prevent normal bone mineralisation.

7. Vitamin D Physiology

Vitamin D can be obtained through:

Skin synthesis after ultraviolet-B exposure

and from:

Dietary sources.

Vitamin D then undergoes two major activation steps.

First, in the:

Liver

it is converted to:

25-hydroxyvitamin D – 25(OH)D.

This is the major circulating form and the usual test used to assess:

Vitamin D status.

8. Renal Activation of Vitamin D

25-hydroxyvitamin D is subsequently converted in the:

Kidney

to:

1,25-dihydroxyvitamin D – calcitriol.

Calcitriol is the biologically active form.

It increases intestinal absorption of:

Calcium and phosphate.

Therefore adequate vitamin D activity provides the minerals required for normal skeletal mineralisation.

9. Causes of Vitamin D Deficiency

Vitamin D deficiency can result from:

Low sunlight exposure.

Poor dietary intake.

Malabsorption.

Chronic liver disease.

Certain medications that alter vitamin D metabolism.

Other factors may increase risk depending on lifestyle, age and underlying disease.

10. Malabsorption

Gastrointestinal disorders can impair absorption of:

Vitamin D

and sometimes:

Calcium.

Important examples include:

Coeliac disease.

Inflammatory bowel disease with significant malabsorption.

Pancreatic insufficiency.

Biliary disease.

Short-bowel states.

Some forms of bariatric surgery.

Therefore unexplained osteomalacia should prompt consideration of:

Malabsorption.

11. Vitamin D Deficiency and Calcium

When vitamin D is deficient:

↓ intestinal Ca²⁺ absorption

↓

Serum calcium tends to fall

↓

Parathyroid glands respond by increasing:

PTH.

This produces:

Secondary hyperparathyroidism.

12. Secondary Hyperparathyroidism

PTH attempts to maintain serum calcium.

It increases:

Renal calcium reabsorption

and promotes mechanisms that help preserve extracellular calcium.

However, PTH simultaneously reduces renal:

Phosphate reabsorption.

Therefore:

Vitamin D deficiency

↓

↓ Calcium absorption

↓

↑ PTH

↓

↑ Renal phosphate loss

↓

Hypophosphataemia

↓

Further impairment of bone mineralisation.

13. Why Calcium May Be Normal

The original biochemical table described calcium as:

Low.

This is possible, but calcium may also be:

Low-normal or even normal.

This occurs because secondary hyperparathyroidism helps maintain serum calcium despite inadequate vitamin D.

Therefore normal serum calcium does not exclude:

Vitamin D deficiency osteomalacia.

14. Typical Biochemical Pattern

In classical vitamin D deficiency osteomalacia:

Calcium: ↓ or low-normal

Phosphate: ↓

ALP: ↑

PTH: ↑

25-hydroxyvitamin D: ↓

This is the high-yield pattern.

15. Why ALP Is Raised

The original notes correctly emphasise:

↑ ALP.

In osteomalacia, osteoblasts remain active and attempt to produce and mineralise new bone.

The defective mineralisation leads to increased osteoblastic activity.

Therefore:

Bone alkaline phosphatase rises.

This makes elevated ALP an important clue to:

Osteomalacia/rickets.

16. Impaired Calcium Metabolism

The original phrase:

“Impaired calcium metabolism”

is broad.

Any disorder producing persistent inadequate availability of calcium for bone mineralisation can contribute.

Examples include:

Low calcium intake.

Calcium malabsorption.

Vitamin D deficiency or resistance.

However, phosphate availability is equally important, and several forms of osteomalacia are fundamentally:

Phosphate-wasting disorders.

17. Hypophosphataemia

Phosphate is essential for formation of:

Hydroxyapatite.

Therefore chronic severe:

Hypophosphataemia

can directly impair bone mineralisation.

This may occur because of:

Renal phosphate wasting

or other disorders of phosphate metabolism.

Therefore:

CHRONIC LOW PHOSPHATE → DEFECTIVE MINERALISATION → OSTEOMALACIA/RICKETS.

18. Proximal Renal Tubular Disease

The original notes correctly identify:

Proximal renal tubular disease.

The proximal tubule normally reabsorbs a large proportion of filtered:

Phosphate.

When proximal tubular function is impaired:

Phosphate is lost in urine.

This can produce:

Hypophosphataemia

and ultimately:

Osteomalacia or rickets.

19. Fanconi Syndrome

A classic proximal tubular disorder is:

Fanconi syndrome.

In Fanconi syndrome there is generalised impairment of proximal tubular reabsorption.

Urinary losses can include:

Phosphate.

Glucose despite normal blood glucose.

Amino acids.

Bicarbonate.

Uric acid.

Therefore phosphate wasting can lead to:

Hypophosphataemic osteomalacia/rickets.

20. Proximal RTA

Proximal tubular dysfunction can also produce:

Type 2 renal tubular acidosis – proximal RTA.

Because bicarbonate reabsorption is impaired:

Bicarbonate is lost in urine.

When proximal RTA occurs as part of Fanconi syndrome, simultaneous phosphate wasting can contribute significantly to:

Bone disease.

21. Chronic Kidney Disease – Important Distinction

Advanced CKD can also produce abnormal bone mineralisation through:

Reduced calcitriol production.

Phosphate retention.

Secondary hyperparathyroidism.

This forms part of:

CKD–mineral and bone disorder – CKD-MBD.

However, its biochemical pattern differs from straightforward vitamin D deficiency because advanced CKD commonly produces:

High phosphate rather than low phosphate.

22. Hypophosphataemic Rickets

Some inherited disorders cause excessive renal phosphate loss.

These include forms of:

FGF23-mediated hypophosphataemic rickets.

The best-known inherited example is:

X-linked hypophosphataemia.

These patients develop persistent renal phosphate wasting despite low serum phosphate.

23. Tumour-Induced Osteomalacia

An important acquired phosphate-wasting disorder is:

Tumour-induced osteomalacia.

Certain usually small mesenchymal tumours produce excessive:

FGF23.

FGF23 causes:

Renal phosphate wasting

and reduces appropriate calcitriol activity.

Therefore:

↑ FGF23 → ↓ renal phosphate reabsorption → hypophosphataemia → osteomalacia.

24. Clinical Features

The original notes correctly identify:

Pain.

Deformity.

Fractures.

Proximal myopathy.

These arise because inadequately mineralised bone cannot withstand normal mechanical stress.

25. Bone Pain

A common symptom is:

Diffuse bone pain or tenderness.

Pain may involve:

Hips.

Pelvis.

Lower back.

Ribs.

Legs.

It can sometimes be mistaken for musculoskeletal or rheumatological disease.

26. Proximal Muscle Weakness

The original notes correctly identify:

Proximal myopathy.

Patients may develop weakness of the:

Hip-girdle

and sometimes:

Shoulder-girdle muscles.

This can produce difficulty:

Rising from a chair.

Climbing stairs.

Walking normally.

27. Waddling Gait

Pelvic and proximal muscle weakness may produce a:

Waddling gait.

This is a useful clinical clue in significant osteomalacia.

The combination of:

Bone pain + proximal weakness + raised ALP

should strongly suggest a metabolic bone disorder such as osteomalacia.

28. Fractures

Poorly mineralised bone is mechanically weak.

Therefore patients may develop:

Insufficiency fractures.

These can occur after relatively minor mechanical stress.

Certain incomplete fractures associated with osteomalacia are called:

Looser zones

or

pseudofractures.

29. Looser Zones

Looser zones represent areas of incomplete mineralisation and stress-related structural failure.

They may appear radiographically as:

Transverse radiolucent lines

often with sclerotic margins.

They can occur in sites such as:

Femoral neck.

Pubic rami.

Ribs.

Scapula.

These are highly suggestive of:

Osteomalacia.

30. Bone Deformity

The original notes correctly include:

Deformity.

In adults, severe longstanding osteomalacia can cause skeletal deformity, but this is particularly striking in:

Rickets, because the growing skeleton is affected.

31. Clinical Features of Rickets

In children, defective growth-plate mineralisation can produce:

Bowing of the legs.

Knock knees.

Widened wrists and ankles.

Delayed growth.

Bone pain.

Muscle weakness.

32. Rachitic Rosary

Expansion of the costochondral junctions may produce palpable enlargements along the chest wall.

This is called:

Rachitic rosary.

It is a classic physical sign of:

Rickets.

33. Harrison Sulcus

Diaphragmatic traction on softened ribs may produce a horizontal depression of the lower chest wall known as:

Harrison sulcus.

This is another traditional clinical sign of significant rickets.

34. Skull Changes in Rickets

Young children may develop:

Craniotabes, representing softening of skull bones.

Other abnormalities can include delayed closure of the:

Fontanelle.

Dental development may also be affected.

35. Lower-Limb Deformities

Because weight-bearing acts on poorly mineralised growing bones, children may develop:

Genu varum – bow legs

or

Genu valgum – knock knees.

The exact deformity depends partly on age and mechanical loading.

36. Growth Disturbance

Because rickets involves the growth plate, affected children may develop:

Impaired linear growth.

Therefore rickets is not simply “osteomalacia in a small child”; the involvement of active growth plates produces distinctive:

Growth and skeletal deformities.

37. Diagnosis

Diagnosis requires integration of:

Clinical features.

Biochemical findings.

Vitamin D status.

Radiographic findings.

and identification of the:

Underlying cause.

38. Serum 25-Hydroxyvitamin D

The preferred biochemical marker for assessing vitamin D stores is:

25-hydroxyvitamin D – 25(OH)D.

In nutritional vitamin D deficiency it is:

Reduced.

Importantly, measuring active:

1,25-dihydroxyvitamin D

is generally not the routine test for determining vitamin D nutritional status.

39. ALP

ALP is commonly:

Elevated.

In children, interpretation requires age-appropriate reference ranges because normal skeletal growth itself produces higher:

Bone ALP levels.

Nevertheless, substantially elevated ALP in the correct clinical context supports active:

Rickets or osteomalacia.

40. PTH

In vitamin D deficiency, PTH is commonly:

Elevated.

This represents:

Secondary hyperparathyroidism.

Therefore:

LOW VITAMIN D + HIGH PTH

is a common pattern in significant deficiency.

41. Radiographs in Rickets

Rickets produces characteristic abnormalities around:

Growth plates, particularly rapidly growing metaphyses.

Typical changes include:

Widening of the growth plate.

Metaphyseal cupping.

Metaphyseal fraying.

Splaying.

These are classic radiological signs.

42. Radiographs in Osteomalacia

Adult osteomalacia may demonstrate:

Reduced bone density

and:

Looser zones/pseudofractures.

However, radiographic appearances can overlap with other metabolic bone disorders, so laboratory findings and clinical context are essential.

43. Treatment Principles

Treatment depends on the:

Underlying cause.

The goals are to restore the minerals necessary for normal bone mineralisation and correct the metabolic abnormality responsible for the disease.

44. Vitamin D Replacement

For nutritional vitamin D deficiency, treatment involves:

Vitamin D replacement.

Adequate calcium intake should also be ensured.

The exact dose and regimen depend on:

Severity of deficiency.

Age.

Malabsorption.

Underlying disease.

Local treatment guidance.

45. Calcium

Adequate:

Calcium intake

is essential for successful mineralisation.

Vitamin D treatment cannot fully restore bone mineralisation if the patient remains severely:

Calcium deficient.

Therefore dietary intake and supplementation requirements should be assessed together.

46. Treat Malabsorption

If deficiency is caused by:

Malabsorption,

the underlying gastrointestinal disorder should be treated whenever possible.

Patients with substantial malabsorption may require different vitamin D replacement strategies and closer monitoring.

47. Treat Phosphate-Wasting Disease

In phosphate-wasting osteomalacia or rickets, simply giving standard vitamin D may not correct the fundamental abnormality.

Treatment depends on the specific cause.

Selected disorders may require:

Phosphate replacement

and appropriate forms of:

Vitamin D therapy.

Certain FGF23-mediated disorders now have targeted treatments in selected patients.

48. Treat Proximal Tubular Disease

When proximal renal tubular dysfunction is responsible:

Correct the underlying tubular disorder where possible.

Treatment may require replacement of substances being lost, such as:

Phosphate

and

Bicarbonate, depending on the defect.

49. Monitoring Treatment

Response can be assessed using:

Symptoms.

Muscle strength.

Calcium.

Phosphate.

ALP.

PTH.

25-hydroxyvitamin D, where appropriate.

ALP may take time to return toward normal because skeletal healing continues after the metabolic abnormality begins to improve.

50. Osteomalacia – Note Form

DEFINITION:

Defective mineralisation of newly formed:

Osteoid in adults.

MAJOR CAUSES:

Vitamin D deficiency.

Calcium deficiency/malabsorption.

Chronic phosphate deficiency.

Renal phosphate wasting.

Proximal tubular disease/Fanconi syndrome.

Selected disorders of vitamin D metabolism or action.

CLINICAL FEATURES:

Diffuse bone pain.

Bone tenderness.

Proximal muscle weakness.

Difficulty rising/climbing stairs.

Waddling gait.

Insufficiency fractures.

Looser zones/pseudofractures.

Skeletal deformity in severe disease.

TYPICAL VITAMIN D DEFICIENCY BIOCHEMISTRY:

Calcium:

↓ or low-normal.

Phosphate:

↓.

ALP:

↑.

PTH:

↑.

25(OH) vitamin D:

↓.

51. Rickets – Note Form

DEFINITION:

Defective mineralisation of:

Growing bone + growth plates in children.

CLINICAL FEATURES:

Bone pain.

Growth impairment.

Widened wrists and ankles.

Bowing of legs.

Genu varum or genu valgum.

Rachitic rosary.

Harrison sulcus.

Craniotabes in younger children.

Muscle weakness.

X-RAY:

Growth-plate widening.

Metaphyseal:

Cupping.

Fraying.

Splaying.

52. Osteomalacia Versus Osteoporosis – Copyable Comparison

OSTEOMALACIA

Primary defect:

Defective mineralisation.

Bone quantity:

May appear reduced, but the fundamental problem is:

Unmineralised osteoid.

Bone pain:

Common.

Proximal muscle weakness:

Common.

Calcium:

Low or low-normal in typical vitamin D deficiency.

Phosphate:

Low.

ALP:

High.

PTH:

High in vitamin D deficiency.

Characteristic fracture:

Looser zone/pseudofracture.

OSTEOPOROSIS

Primary defect:

Reduced amount and impaired architecture of normally mineralised bone.

Bone pain:

Usually absent until:

Fracture occurs.

Proximal myopathy:

Not a characteristic primary feature.

Calcium:

Normal.

Phosphate:

Normal.

ALP:

Normal in uncomplicated disease.

PTH:

Usually:

Normal.

Characteristic problem:

Fragility fractures, especially hip, vertebral and distal radius.

53. Osteomalacia Versus Paget’s Disease

OSTEOMALACIA:

Mineralisation:

Defective.

Ca²⁺:

↓ or low-normal.

PO₄³⁻:

↓.

ALP:

↑.

PTH:

↑ in vitamin D deficiency.

PAGET’S DISEASE:

Mineralisation is not the primary problem.

There is:

Excessive, disorganised bone remodelling.

Ca²⁺:

Normal.

PO₄³⁻:

Normal.

ALP:

↑↑.

PTH:

Normal.

54. Important Clarifications to the Original Notes

The original statement:

“Decreased mineralisation of osteoid”

is correct.

More precisely:

OSTEOMALACIA = DEFECTIVE MINERALISATION OF NEWLY FORMED OSTEOID IN ADULTS.

RICKETS = DEFECTIVE MINERALISATION OF GROWING BONE AND GROWTH PLATES IN CHILDREN.

The original:

“Impaired calcium metabolism”

is too broad on its own.

Remember that successful mineralisation requires both:

Calcium and phosphate.

Therefore chronic:

Hypophosphataemia

is also an important mechanism.

The original:

“Proximal renal tubular disease”

is particularly important because proximal tubular dysfunction can cause:

Renal phosphate wasting.

Think especially of:

FANCONI SYNDROME → PHOSPHATURIA → HYPOPHOSPHATAEMIA → OSTEOMALACIA/RICKETS.

The original:

“↑ ALP”

is a major high-yield clue and should be retained.

Key Clinical Pattern

For rapid recall:

OSTEOMALACIA = SOFT BONE DUE TO DEFECTIVE MINERALISATION.

Think:

VITAMIN D DEFICIENCY

↓

↓ INTESTINAL Ca²⁺ ABSORPTION

↓

↑ PTH

↓

↑ RENAL PHOSPHATE LOSS

↓

↓ PO₄³⁻

↓

DEFECTIVE BONE MINERALISATION.

The classic vitamin D deficiency pattern is:

Ca²⁺ = ↓ / LOW-NORMAL

PO₄³⁻ = ↓

ALP = ↑

PTH = ↑

25(OH)D = ↓

The classic adult presentation is:

BONE PAIN + PROXIMAL MUSCLE WEAKNESS + FRACTURES/PSEUDOFRACTURES + ↑ ALP.

The classic childhood presentation is:

RICKETS → GROWTH-PLATE ABNORMALITY + BOWED LEGS + WIDENED WRISTS/ANKLES + RACHITIC ROSARY.

And the most useful distinction is:

OSTEOPOROSIS → NORMAL MINERALISATION, NORMAL Ca/PO₄/ALP.

OSTEOMALACIA → DEFECTIVE MINERALISATION, ↑ ALP with characteristic mineral abnormalities.

Medicine – Paget’s Disease of Bone

Paget’s disease of bone, also called osteitis deformans, is a chronic disorder of bone remodelling characterised by markedly increased and disorganised bone turnover.

There is initially excessive osteoclastic bone resorption, followed by excessive but poorly organised osteoblastic new bone formation. The newly formed bone is therefore enlarged and dense in places, but its architecture is abnormal and mechanically weaker than normal bone.

The characteristic biochemical finding is:

Markedly raised alkaline phosphatase – ALP ↑↑

with usually:

Normal calcium and normal phosphate.

1. Normal Bone Remodelling

Normal bone undergoes continuous remodelling through coordinated activity between:

Osteoclasts – resorb old bone

and

Osteoblasts – form new bone.

Normally these processes are tightly coupled, allowing old or damaged bone to be replaced by structurally organised new bone.

In Paget’s disease, this process becomes:

Excessive + accelerated + disorganised.

2. Pathophysiology

The disease typically begins with excessive:

Osteoclastic bone resorption.

This is followed by a compensatory increase in:

Osteoblastic bone formation.

However, the new bone is deposited rapidly and in a disorganised fashion.

Therefore:

↑ Osteoclast activity

↓

Excessive bone resorption

↓

Compensatory ↑↑ osteoblast activity

↓

Rapid abnormal bone formation

↓

Enlarged, architecturally disorganised and mechanically abnormal bone.

3. Mosaic Pattern of Bone

Normal mature lamellar bone has an organised architecture.

In Paget’s disease, repeated cycles of abnormal resorption and formation produce irregular cement lines.

Histologically this produces the characteristic:

Mosaic pattern of lamellar bone.

This is an important pathological feature of Paget’s disease.

4. Distribution of Disease

Paget’s disease may involve:

One bone – monostotic disease

or:

Multiple bones – polyostotic disease.

However, the disease does not normally spread directly from one bone to another.

Each affected skeletal site represents a separate focus.

5. Commonly Affected Bones

Common sites include:

Pelvis.

Femur.

Lumbar spine.

Skull.

Tibia.

These locations help explain many of the characteristic complications.

6. Age

Paget’s disease is predominantly a disorder of:

Older adults.

It is uncommon in young people, and prevalence rises considerably with:

Increasing age.

Many patients are diagnosed incidentally when an elevated ALP or characteristic radiographic abnormality is discovered.

7. Clinical Presentation

A very important point is that many patients with Paget’s disease are:

Asymptomatic.

The disease may be discovered because of:

Incidentally elevated ALP

or

An abnormal X-ray obtained for another reason.

When symptoms occur, the original notes correctly identify:

Bone pain.

Bone deformity.

Secondary arthritis.

Nerve compression.

Pathological fractures.

Rarely:

Sarcomatous transformation.

8. Bone Pain

The most common symptomatic presentation is:

Bone pain.

The pain may be:

Deep.

Aching.

Persistent.

It may arise from increased bone turnover itself or from complications such as:

Microfractures, deformity or secondary osteoarthritis.

9. Bone Deformity

Because Pagetic bone is remodelled abnormally, affected bones may become:

Enlarged.

Thickened.

Bowed.

Deformed.

Weight-bearing long bones are particularly susceptible to deformity.

10. Bowing of the Tibia or Femur

Paget’s disease involving the lower limbs may cause:

Bowing of the tibia

or

Bowing of the femur.

This alters mechanical loading across nearby joints and can contribute to:

Pain and secondary osteoarthritis.

11. Skull Involvement

Paget’s disease of the skull can cause progressive:

Skull enlargement and thickening.

Historically, patients may report that:

Their hat size has increased.

Skull involvement can also produce:

Headache

and important neurological complications.

12. Hearing Loss

A particularly important complication of skull involvement is:

Hearing impairment.

Changes in the temporal bone and structures surrounding the auditory apparatus can interfere with normal hearing.

Therefore:

PAGET’S DISEASE + ENLARGED SKULL + HEARING LOSS

is a classic clinical association.

13. Secondary Osteoarthritis

The original notes correctly include:

Arthritis.

More precisely, Paget’s disease can cause:

Secondary osteoarthritis.

Deformed bone changes the normal alignment and mechanical loading of adjacent joints.

This accelerates:

Degenerative joint disease.

Commonly affected areas may include the:

Hip

and

Knee.

14. Nerve Compression

The original notes correctly include:

Nerve compression.

Pagetic bone may enlarge sufficiently to compress nearby:

Nerves

or other neural structures.

This is particularly relevant when disease affects the:

Skull

or

Spine.

15. Neurological Complications

Depending on the affected site, neurological complications can include:

Hearing loss.

Radiculopathy.

Spinal stenosis.

Spinal cord or nerve-root compression.

Other cranial neuropathies are possible but less common.

Therefore new neurological symptoms in a patient with Paget’s disease require appropriate assessment.

16. Pathological Fractures

The original notes correctly include:

Fractures.

Although Pagetic bone can become enlarged and radiographically dense, it is:

Structurally abnormal and mechanically weaker.

Therefore affected bones are more susceptible to:

Pathological or insufficiency fractures.

17. Femoral Fractures

Long bones affected by Paget’s disease may develop:

Fissure fractures

and complete fractures.

The:

Femur

is particularly important because deformity and abnormal mechanical stress may coexist.

18. Sarcomatous Transformation

The original notes correctly include:

Sarcoma.

Malignant transformation is a:

Rare but serious complication.

The classic malignancy is:

Osteosarcoma.

Other bone sarcomas may occur less commonly.

19. When to Suspect Sarcomatous Transformation

Concerning features include:

New or rapidly worsening bone pain.

Increasing swelling or mass.

Rapidly progressive destructive radiographic change.

Such features require urgent investigation.

However, malignant transformation occurs in only a:

Small minority of patients.

Therefore Paget’s disease should not be regarded as routinely premalignant.

20. High-Output Cardiac Failure

Extensive Paget’s disease can produce increased:

Bone vascularity.

In very extensive disease, blood flow through affected bone can increase substantially.

Rarely, this may contribute to:

High-output cardiac failure.

This is an uncommon complication but a classic examination association.

21. Alkaline Phosphatase

The most characteristic biochemical abnormality is:

ALP ↑↑.

This reflects the marked increase in:

Osteoblastic activity and bone formation.

Therefore an older patient with:

Markedly raised ALP

but:

Normal calcium and phosphate

should raise suspicion for Paget’s disease, particularly when liver disease has been excluded.

22. Why ALP Is Raised

After excessive osteoclastic resorption, osteoblasts become highly active in attempting to rebuild bone.

Osteoblasts produce:

Bone-specific alkaline phosphatase.

Therefore:

↑↑ bone formation → ↑↑ ALP.

The magnitude of ALP elevation often broadly reflects the:

Extent and activity of disease.

23. Calcium

The original notes correctly emphasise that calcium is generally:

Normal.

Despite extensive bone turnover, systemic calcium homeostasis is usually maintained.

Therefore the classic pattern is:

Ca²⁺ = normal.

24. Hypercalcaemia and Immobilisation

The traditional teaching that calcium becomes raised during:

Immobilisation

is reasonable but needs qualification.

Hypercalcaemia is not a routine feature of Paget’s disease.

It may occasionally develop in a patient with active Paget’s disease who becomes substantially immobilised because bone resorption continues while mechanical loading falls.

However, if hypercalcaemia is found, clinicians should also investigate other causes such as:

Primary hyperparathyroidism or malignancy.

25. Phosphate

Serum phosphate is usually:

Normal.

Therefore the classic biochemical pattern is:

Ca²⁺ normal

PO₄³⁻ normal

ALP ↑↑

PTH usually normal.

This pattern is extremely useful for examinations.

26. PTH

PTH is usually:

Normal.

This distinguishes Paget’s disease from disorders such as:

Primary hyperparathyroidism

and

Secondary hyperparathyroidism due to CKD or vitamin D deficiency.

27. Liver Versus Bone ALP

An isolated elevation of total ALP does not automatically indicate bone disease because ALP is also produced by:

Liver and biliary tissue.

Therefore if the source is uncertain, clinicians may use:

Liver biochemical tests

and sometimes:

Bone-specific ALP.

If ALP is markedly elevated while other liver markers do not suggest cholestatic disease, a bone source becomes more likely.

28. Diagnosis

The original notes correctly state that diagnosis is based on:

Clinical features

plus characteristic:

Radiographs

and, when appropriate:

Bone scintigraphy.

Biochemistry helps identify active disease but does not by itself establish the complete anatomical extent.

29. Plain Radiographs

Affected bones may show a mixture of:

Osteolysis

and

Sclerosis.

This reflects the different phases of abnormal remodelling.

Other features include:

Cortical thickening.

Bone enlargement.

Coarsened trabeculae.

Deformity.

30. Skull X-Ray

Skull involvement can produce patchy areas of sclerosis.

The classic descriptive appearance is:

“Cotton-wool” skull.

This results from irregular areas of increased bone density.

31. Long-Bone Radiographic Changes

Long bones may demonstrate:

Cortical thickening.

Trabecular coarsening.

Bone enlargement.

Bowing deformity.

Early active osteolysis may advance along a long bone as a characteristic:

Blade-of-grass or flame-shaped advancing edge.

32. Bone Scan

A radionuclide:

Bone scan

is particularly useful for determining:

The distribution and extent of active Paget’s disease.

Affected areas demonstrate:

Increased tracer uptake

because of the high rate of bone turnover.

Therefore:

X-ray → characterises the lesion.

Bone scan → maps the extent of active skeletal involvement.

33. Bone Biopsy

Bone biopsy is:

Not routinely required

when the biochemical and radiological findings are typical.

It may be considered if the diagnosis is uncertain or there is concern about:

Malignant transformation.

34. Treatment Principles

Not every patient with Paget’s disease requires active pharmacological treatment.

Treatment is particularly considered when disease is:

Symptomatic

or when active disease involves sites where complications are a significant concern.

The major treatment goals are:

Relieve bone pain.

Suppress excessive bone turnover.

Treat or prevent complications when possible.

35. Analgesia

The original notes correctly include:

Analgesia.

Pain management depends on its cause.

Simple analgesics may help, while pain from:

Secondary osteoarthritis

may require additional musculoskeletal management.

However, pain directly attributable to metabolically active Paget’s disease may improve when bone turnover is suppressed with:

Bisphosphonate therapy.

36. Bisphosphonates

The original notes correctly identify:

Bisphosphonates

as the major pharmacological treatment.

Bisphosphonates inhibit:

Osteoclast-mediated bone resorption.

This suppresses the abnormal remodelling cycle.

Therefore:

↓ Osteoclast activity

↓

↓ Excessive bone turnover

↓

↓ ALP

↓

Improvement in disease activity and often:

Bone pain.

37. Zoledronic Acid

A particularly effective treatment is:

Intravenous zoledronic acid.

A single infusion can produce a prolonged biochemical remission in many appropriately selected patients.

Renal function, calcium and vitamin D status need consideration before bisphosphonate therapy.

38. Monitoring Treatment

Treatment response can be followed using:

Serum ALP.

As disease activity falls:

ALP generally decreases.

Therefore ALP is useful both for:

Initial assessment of activity

and

Monitoring biochemical response to treatment.

39. Calcium and Vitamin D

Adequate:

Calcium

and

Vitamin D

status is important, particularly around potent bisphosphonate treatment.

Vitamin D deficiency should be identified and corrected where appropriate because potent inhibition of bone resorption can otherwise increase the risk of:

Hypocalcaemia.

40. Orthopaedic Treatment

Some complications require:

Orthopaedic management.

Examples include:

Pathological fractures.

Severe deformity.

Advanced secondary osteoarthritis requiring joint replacement.

Neurological compression may occasionally require specialist surgical assessment.

41. Paget’s Disease – Clinical Features in Note Form

BONE PAIN

Deep aching pain from active disease or complications.

BONE DEFORMITY

Enlarged and bowed bones.

Increasing skull size.

Bowing of long bones.

SECONDARY OSTEOARTHRITIS

Abnormal bone alignment alters joint mechanics.

Commonly affects joints adjacent to Pagetic bone.

NERVE COMPRESSION

Hearing impairment.

Radiculopathy.

Spinal stenosis.

Other neurological compression depending on site.

FRACTURES

Abnormally remodelled bone is mechanically weak.

Pathological/insufficiency fractures may occur.

SARCOMA

Rare malignant transformation.

Classically:

Osteosarcoma.

HIGH-OUTPUT HEART FAILURE

Rare.

May occur with very extensive, highly vascular disease.

42. Biochemistry – Note Form

ALP:

↑↑

The characteristic biochemical abnormality.

Calcium:

Usually:

Normal.

May rarely rise with substantial immobilisation, but hypercalcaemia should prompt consideration of additional causes.

Phosphate:

Usually:

Normal.

PTH:

Usually:

Normal.

Therefore:

PAGET = NORMAL Ca²⁺ + NORMAL PO₄³⁻ + MARKEDLY HIGH ALP.

43. Diagnosis – Note Form

Clinical presentation:

Often asymptomatic.

May have bone pain, deformity or complications.

Blood tests:

Markedly elevated ALP.

Usually normal calcium and phosphate.

Plain X-ray:

Mixed lytic and sclerotic changes.

Cortical thickening.

Coarse trabeculae.

Bone enlargement.

Deformity.

Cotton-wool skull.

Blade-of-grass/flame-shaped advancing osteolysis in long bones.

Bone scan:

Increased uptake in active lesions.

Useful for determining:

Extent of skeletal involvement.

44. Treatment – Note Form

ANALGESIA

For symptomatic pain.

BISPHOSPHONATES

Main disease-suppressing therapy.

Particularly:

IV zoledronic acid in appropriate patients.

CALCIUM/VITAMIN D

Ensure adequate status, especially around potent bisphosphonate treatment.

ORTHOPAEDIC/SPECIALIST MANAGEMENT

For fractures.

Severe deformity.

Advanced osteoarthritis.

Neurological compression.

Suspected sarcomatous transformation.

45. Paget’s Disease Versus Osteoporosis

PAGET’S DISEASE:

Bone turnover:

Markedly increased and disorganised.

ALP:

↑↑

Calcium:

Normal.

Phosphate:

Normal.

Bone may be:

Enlarged and deformed.

OSTEOPOROSIS:

Bone mass:

Reduced.

Bone mineralisation:

Normal.

ALP:

Normal.

Calcium:

Normal.

Phosphate:

Normal.

Main consequence:

Fragility fractures.

46. Paget’s Disease Versus Osteomalacia

PAGET’S DISEASE:

Ca²⁺:

Normal.

PO₄³⁻:

Normal.

ALP:

↑↑

PTH:

Usually normal.

VITAMIN D DEFICIENCY OSTEOMALACIA:

Ca²⁺:

Low or low-normal.

PO₄³⁻:

Low.

ALP:

↑.

PTH:

↑.

Therefore:

NORMAL Ca + NORMAL PO₄ + VERY HIGH ALP → THINK PAGET’S DISEASE.

47. Important Clarifications to the Original Notes

The statement:

“Increased bone turnover with abnormal new bone turnover”

is better expressed as:

EXCESSIVE OSTEOCLASTIC RESORPTION FOLLOWED BY EXCESSIVE, DISORGANISED OSTEOBLASTIC NEW BONE FORMATION.

The original:

“↑↑ ALP”

is a particularly important and correct examination finding.

Remember:

ALP ↑↑ while Ca²⁺ and phosphate are usually normal.

The statement:

“Calcium raised only with immobility”

should be softened.

Serum calcium is:

Usually normal.

Hypercalcaemia can occasionally occur during significant immobilisation in active disease, but if calcium is elevated, other causes should also be considered.

The original diagnostic approach is correct:

Characteristic radiographs establish the structural pattern, while a bone scan helps determine the extent of active disease.

The original treatment principle is also correct:

Analgesia + bisphosphonates.

For metabolically active symptomatic disease requiring anti-Pagetic therapy, a potent bisphosphonate such as:

Zoledronic acid

is an important modern option.

Key Clinical Pattern

For rapid recall:

PAGET’S DISEASE = EXCESSIVE + DISORGANISED BONE REMODELLING.

The sequence is:

↑ OSTEOCLAST ACTIVITY

↓

↑ BONE RESORPTION

↓

↑↑ COMPENSATORY OSTEOBLAST ACTIVITY

↓

DISORGANISED NEW BONE

↓

ENLARGED BUT MECHANICALLY ABNORMAL BONE.

The classic biochemical pattern is:

Ca²⁺ = NORMAL

PO₄³⁻ = NORMAL

ALP = ↑↑

PTH = NORMAL.

The classic clinical features are:

BONE PAIN + DEFORMITY + SECONDARY ARTHRITIS + HEARING/NEURAL COMPRESSION + FRACTURES.

Rarely:

OSTEOSARCOMA.

The classic investigation clues are:

↑↑ ALP + COTTON-WOOL SKULL + COARSE/THICKENED ABNORMAL BONE + INCREASED UPTAKE ON BONE SCAN.

And the major disease-suppressing treatment is:

BISPHOSPHONATE THERAPY, particularly zoledronic acid when appropriate.

Medicine – Osteoporosis

Osteoporosis is a systemic skeletal disorder characterised by reduced bone strength, resulting in increased susceptibility to fragility fractures. Bone strength depends on both the amount of bone present and the quality of its internal structure.

The key pathological features are:

Reduced bone mass and bone mineral density.

Deterioration of bone microarchitecture.

Increased bone fragility and fracture risk.

Importantly, the bone that remains is generally normally mineralised. This distinguishes osteoporosis from osteomalacia, in which there is defective mineralisation of osteoid.

1. Normal Bone Remodelling

Bone is continuously renewed through a process of:

Bone resorption by osteoclasts

followed by:

Bone formation by osteoblasts.

In healthy adults, these processes are normally balanced sufficiently to maintain skeletal strength.

When bone resorption chronically exceeds bone formation:

Progressive bone loss occurs.

↓

Trabeculae become thinner and disconnected.

↓

Cortical bone becomes thinner and more porous.

↓

Bone strength decreases.

↓

Fragility fractures become more likely.

2. Reduced Bone Mass and Density

Osteoporosis causes a reduction in the quantity of bone.

This can be detected clinically by measuring:

Bone mineral density – BMD.

However, osteoporosis is not simply “low calcium in the bones.” It involves loss of the structural framework of bone itself.

Therefore routine serum:

Calcium, phosphate and ALP are usually normal.

3. Abnormal Bone Microarchitecture

The second major feature is deterioration of the microscopic architecture of bone.

In trabecular bone:

Trabeculae become thinner and may disappear or lose connectivity.

In cortical bone:

Cortical thickness decreases and porosity increases.

The result is a skeleton that is mechanically weaker even before a fracture occurs.

4. Primary Osteoporosis

Primary osteoporosis develops without another specific disease being primarily responsible.

Traditional teaching divides it into:

Type I – postmenopausal osteoporosis.

Type II – age-related or senile osteoporosis.

This classification remains useful for understanding the mechanisms, although modern clinical practice often discusses postmenopausal and age-related osteoporosis without rigidly separating them into Type I and Type II.

5. Type I – Postmenopausal Osteoporosis

Type I osteoporosis occurs predominantly following:

Menopause.

The major mechanism is:

Oestrogen deficiency.

Oestrogen normally helps restrain osteoclast-mediated bone resorption.

After menopause:

↓ Oestrogen

↓

↑ Osteoclast activity and bone turnover

↓

Bone resorption exceeds formation

↓

Accelerated bone loss.

6. Trabecular Bone in Postmenopausal Osteoporosis

Postmenopausal bone loss particularly affects:

Trabecular bone.

Trabecular bone is abundant in:

Vertebral bodies

and at several other fracture-prone skeletal sites.

Therefore postmenopausal osteoporosis is strongly associated with:

Vertebral compression fractures.

It also contributes to other fragility fractures, including hip and distal radius fractures.

7. Type II – Age-Related Osteoporosis

Type II osteoporosis occurs with:

Advancing age.

The mechanism is multifactorial and is not simply a reduction in osteoblast activity.

Ageing is associated with:

Reduced bone formation.

Altered bone remodelling.

Hormonal changes.

Reduced physical activity.

Reduced calcium and vitamin D availability in some individuals.

Loss of muscle mass and increased fall risk.

Both:

Cortical

and

Trabecular bone

are affected.

8. Fragility Fractures

The major clinical consequence of osteoporosis is:

Fragility fracture.

This means a fracture occurring after trauma that would not normally be expected to fracture healthy bone, classically:

A fall from standing height or less.

Common sites include:

Hip – proximal femur.

Vertebrae.

Distal radius – Colles-type fracture.

Proximal humerus.

9. Vertebral Compression Fractures

Vertebral fractures may occur with:

Minimal trauma

or even without a clearly remembered injury.

They can cause:

Back pain.

Loss of height.

Thoracic kyphosis.

Multiple vertebral compression fractures may progressively produce a:

Stooped posture.

However, many vertebral fractures are initially clinically silent.

10. Secondary Osteoporosis

Secondary osteoporosis occurs because another disease, medication or environmental factor accelerates bone loss.

The original notes appropriately group the causes into:

Endocrine disorders.

Malignancy.

Gastrointestinal and nutritional disease.

Inflammatory disease.

Drugs.

Lifestyle and immobilisation.

11. Premature Menopause

The original notes correctly identify:

Premature menopause

as a major risk factor.

Earlier loss of ovarian oestrogen means a longer lifetime period of:

Oestrogen deficiency.

Therefore bone resorption increases earlier than expected.

Other causes of premature ovarian insufficiency can similarly increase osteoporosis risk.

12. Hypogonadism

Hypogonadism can cause osteoporosis in both:

Women

and

Men.

Reduced sex hormones increase bone turnover and reduce maintenance of skeletal mass.

Therefore:

↓ Oestrogen or testosterone → ↑ bone loss → osteoporosis.

This is why prolonged hypogonadism is an important secondary cause in younger patients.

13. Anorexia Nervosa

The original notes correctly include:

Anorexia nervosa.

Several mechanisms may contribute:

Low body weight.

Reduced sex hormones.

Nutritional deficiencies.

Reduced IGF-1 and other endocrine alterations.

The resulting reduction in bone formation and increase in skeletal fragility can produce markedly reduced BMD, particularly when the illness occurs during the years of normal peak bone-mass acquisition.

14. Cushing Syndrome

Excess glucocorticoid activity in:

Cushing syndrome

is an important cause of secondary osteoporosis.

Glucocorticoids reduce:

Osteoblast function and bone formation.

They can also alter calcium balance, muscle strength and gonadal function.

Therefore chronic glucocorticoid excess can produce substantial:

Bone loss and fracture risk.

15. Hyperparathyroidism

The original notes correctly include:

Hyperparathyroidism.

Excess PTH increases bone turnover and can promote:

Cortical bone loss.

Primary hyperparathyroidism is particularly suggested when osteoporosis is accompanied by:

Hypercalcaemia + inappropriately elevated PTH.

This differs from uncomplicated osteoporosis, where calcium and PTH are generally normal.

16. Hyperthyroidism

Excess thyroid hormone accelerates:

Bone turnover.

Although both formation and resorption increase, resorption can predominate, producing:

Net bone loss.

Therefore untreated or prolonged:

Hyperthyroidism

increases osteoporosis and fracture risk.

Excessive thyroid-hormone replacement causing persistent TSH suppression may also contribute in susceptible patients.

17. Multiple Myeloma

The original notes include:

Multiple myeloma.

Myeloma causes bone disease primarily through abnormal plasma-cell activity and increased osteoclast activation, producing:

Osteolytic lesions and pathological fractures.

It can therefore mimic or coexist with osteoporosis.

A patient with apparent osteoporosis plus features such as:

Anaemia, renal impairment, hypercalcaemia, unexplained bone pain or monoclonal protein

requires evaluation for myeloma rather than assuming uncomplicated primary osteoporosis.

18. Leukaemia and Other Malignancies

Certain haematological malignancies, including:

Leukaemia

and other malignant disorders, can adversely affect skeletal health through the disease itself, nutritional effects, hormonal disturbance or treatments such as:

Glucocorticoids and chemotherapy.

However, myeloma has a particularly important direct relationship with pathological bone loss.

19. Malabsorption Syndromes

The original notes correctly identify:

Malabsorption

as a cause.

Conditions such as:

Coeliac disease

can reduce absorption of:

Calcium and vitamin D.

This may lead to reduced BMD.

Depending on the severity and mechanism, patients may develop:

Osteoporosis, osteomalacia, or a combination of skeletal abnormalities.

Therefore abnormal calcium, phosphate, ALP or vitamin D results should raise the possibility of accompanying metabolic bone disease rather than simple osteoporosis alone.

20. Chronic Liver Disease

The original notes correctly include:

Chronic liver disease.

Chronic liver disorders can contribute to metabolic bone disease through multiple mechanisms, including:

Malnutrition.

Reduced physical activity.

Hormonal abnormalities.

Vitamin D disturbances.

Chronic inflammation.

The term hepatic osteodystrophy may be used for skeletal disease associated with chronic liver disease.

21. Inflammatory Bowel Disease

The original notes correctly identify:

Inflammatory bowel disease – IBD.

Osteoporosis risk can increase because of:

Chronic inflammation.

Malabsorption.

Low body weight.

Vitamin D deficiency.

Glucocorticoid treatment.

Therefore several mechanisms may operate simultaneously.

22. Rheumatoid Arthritis

The original notes correctly include:

Rheumatoid arthritis – RA.

Chronic systemic inflammation can promote bone loss.

Additional contributors include:

Reduced mobility.

Low body weight in some patients.

Glucocorticoid exposure.

Therefore osteoporosis is an important comorbidity in patients with chronic inflammatory disease.

23. Glucocorticoids

The most important medication-related cause in the original notes is:

Glucocorticoid therapy.

Long-term systemic glucocorticoids such as:

Prednisolone

can rapidly increase fracture risk.

Their effects include:

Reduced osteoblast activity.

Reduced bone formation.

Increased osteoblast/osteocyte apoptosis.

Reduced intestinal calcium absorption.

Increased renal calcium loss.

Muscle weakness and increased fall risk.

Therefore:

CHRONIC GLUCOCORTICOID USE → MAJOR SECONDARY OSTEOPOROSIS RISK.

24. Heparin

Prolonged exposure to:

Unfractionated heparin

can contribute to bone loss and osteoporosis.

This is mainly relevant with:

Long-term therapy.

The skeletal effect is less prominent with low-molecular-weight heparins, although prolonged exposure still requires appropriate clinical consideration.

25. Other Important Drug Causes

Modern secondary osteoporosis assessment also considers medications such as:

Aromatase inhibitors.

Androgen-deprivation therapy.

Some antiseizure medications.

Excess thyroid hormone replacement.

The patient’s complete medication history is therefore important when investigating unexpectedly low BMD or fragility fractures.

26. Immobilisation

The original notes correctly identify:

Immobilisation.

Mechanical loading is an important stimulus for maintaining bone.

Prolonged inactivity causes:

Reduced bone formation

and increased resorption.

Therefore prolonged:

Bed rest.

Paralysis.

Severe mobility restriction.

can accelerate bone loss.

27. Smoking

The original notes correctly include:

Smoking.

Smoking is associated with lower bone density and increased fracture risk through several mechanisms, including adverse effects on:

Bone cells, sex hormones and overall skeletal health.

Smoking cessation is therefore part of osteoporosis prevention and management.

28. Alcohol

The original notes include:

Alcoholism, better described clinically as chronic excessive alcohol intake.

Excessive alcohol can contribute through:

Poor nutrition.

Direct adverse effects on bone formation.

Hormonal abnormalities.

Liver disease.

Increased falls.

Moderating excessive alcohol intake is therefore an important preventive measure.

29. Other Important Risk Factors

Several important osteoporosis risk factors deserve addition to the original list.

These include:

Increasing age.

Previous fragility fracture.

Parental history of hip fracture.

Low body mass index.

Low physical activity.

Long-term glucocorticoid exposure.

Hypogonadism.

Smoking.

Excess alcohol.

Conditions associated with falls.

A previous fragility fracture is particularly important because it predicts a substantially increased risk of:

Future fractures.

30. Diagnosis

The diagnosis is based on:

Clinical fracture history

and/or

Bone mineral density assessment, depending on the circumstances.

The standard test for measuring BMD is:

Dual-energy X-ray absorptiometry – DXA or DEXA.

The usual sites assessed are:

Lumbar spine

and

Hip.

31. T-Score

The T-score compares the patient’s BMD with the mean BMD of a healthy young adult reference population.

In the appropriate population, the traditional diagnostic categories are:

Normal: T-score ≥ −1.0

Low bone mass/osteopenia: T-score between −1.0 and −2.5

Osteoporosis: T-score ≤ −2.5

A fragility fracture can also establish clinically important osteoporosis/high fracture risk even when the DXA value is not below −2.5, depending on the fracture and clinical context.

32. Z-Score

The:

Z-score

compares BMD with people of similar:

Age and sex.

It is particularly useful when evaluating younger individuals, where unexpectedly low BMD may suggest:

Secondary causes.

A markedly low Z-score should prompt careful investigation for underlying disease.

33. Blood Tests in Osteoporosis

The original notes correctly state:

Calcium = normal.

Phosphate = normal.

ALP = normal.

This is the classic pattern for:

Uncomplicated primary osteoporosis.

PTH is also generally:

Normal.

34. Why Blood Tests Are Normal

Osteoporosis represents:

Loss of normally mineralised bone.

It is not primarily caused by defective mineralisation.

Therefore serum mineral concentrations generally remain normal.

This gives an extremely useful distinction:

OSTEOPOROSIS → NORMAL Ca²⁺, PO₄³⁻ AND ALP.

35. Investigating Secondary Causes

Laboratory investigations are useful not because they directly diagnose primary osteoporosis, but because they may reveal:

Secondary causes.

Depending on the patient, investigations may include:

Calcium and phosphate.

ALP.

Renal function.

Liver tests.

25-hydroxyvitamin D.

Thyroid function.

Full blood count.

Further testing for PTH, coeliac disease, myeloma, hypogonadism or other conditions depends on the clinical picture.

36. Osteoporosis Versus Osteomalacia

This distinction is extremely important.

OSTEOPOROSIS:

The amount of bone is reduced.

The remaining bone is:

Normally mineralised.

Typical laboratory pattern:

Ca²⁺ normal.

PO₄³⁻ normal.

ALP normal.

OSTEOMALACIA:

There is:

Defective mineralisation of osteoid.

In typical vitamin D deficiency:

Ca²⁺ low or low-normal.

PO₄³⁻ low.

ALP high.

PTH high.

Therefore:

NORMAL BONE BIOCHEMISTRY → THINK OSTEOPOROSIS.

HIGH ALP + LOW PHOSPHATE → THINK OSTEOMALACIA, in the appropriate context.

37. Fracture-Risk Assessment

BMD is only one component of fracture risk.

Clinical tools such as:

FRAX

can estimate fracture probability using factors such as age, previous fracture, smoking, glucocorticoids and other clinical risks, with or without femoral-neck BMD.

Treatment decisions therefore depend on:

Overall fracture risk, not simply one DXA number.

38. Treatment – General Principles

The goals of treatment are to:

Prevent fractures.

Maintain or increase bone strength.

Treat secondary causes.

Reduce fall risk.

Maintain adequate calcium and vitamin D status.

Medication choice depends on fracture risk, previous fractures, renal function, age, sex, contraindications and other clinical factors.

39. Treat the Underlying Cause

In secondary osteoporosis, treatment should address the underlying disorder whenever possible.

Examples include:

Treat hyperthyroidism.

Correct hypogonadism where appropriate.

Treat malabsorption.

Correct vitamin D deficiency.

Minimise unnecessary systemic glucocorticoid exposure.

Address excessive alcohol and smoking.

40. Calcium and Vitamin D

The original notes correctly include:

Calcium and vitamin D.

Adequate calcium intake and vitamin D status are important components of bone health.

However, supplementation alone is generally not sufficient treatment for a patient at high fracture risk.

Dietary calcium is usually preferred where adequate, with supplementation used when required.

41. Exercise and Falls Prevention

Regular:

Weight-bearing exercise

and

Resistance exercise

help maintain musculoskeletal function.

Falls prevention is also extremely important, particularly in older adults.

Measures may include addressing:

Muscle weakness.

Poor balance.

Visual impairment.

Sedating medications.

Environmental fall hazards.

Preventing the fall may prevent the fracture.

42. Bisphosphonates

The original notes correctly identify:

Bisphosphonates

as a major treatment.

Examples include:

Alendronate.

Risedronate.

Zoledronic acid.

Bisphosphonates bind to bone mineral and inhibit:

Osteoclast-mediated bone resorption.

Therefore:

↓ Osteoclast activity → ↓ bone loss → ↓ fracture risk.

They remain major first-line therapies for many patients.

43. Oral Bisphosphonate Administration

Oral bisphosphonates have specific administration requirements because absorption is poor and they can irritate the oesophagus.

They are generally taken:

On an empty stomach with plain water

and the patient remains:

Upright afterward.

Exact administration instructions depend on the preparation.

44. Important Bisphosphonate Adverse Effects

Potential adverse effects include:

Upper gastrointestinal irritation with oral preparations.

Acute-phase symptoms after some IV doses.

Rare but important long-term complications include:

Osteonecrosis of the jaw

and

Atypical femoral fractures.

These are uncommon, and treatment decisions balance these risks against the patient’s fracture risk.

Renal function is also relevant when selecting therapy.

45. Denosumab

An important modern treatment absent from the original list is:

Denosumab.

Denosumab is a monoclonal antibody against:

RANKL.

This suppresses osteoclast formation and activity, reducing:

Bone resorption.

It is an effective antiresorptive treatment in appropriately selected patients.

46. Important Point About Denosumab

Denosumab should not simply be stopped or substantially delayed without an appropriate management plan.

Stopping it can cause:

Rapid rebound bone turnover

and an increased risk of:

Multiple vertebral fractures.

Therefore another antiresorptive treatment is often required when denosumab is discontinued.

47. Anabolic Therapy

Patients at particularly high fracture risk may be considered for bone-forming therapy.

Examples include:

Teriparatide, a PTH analogue,

and in appropriate settings:

Romosozumab, which inhibits sclerostin and has substantial bone-building effects.

These treatments are generally used in selected high-risk patients according to local guidelines and contraindications.

48. Calcitonin – Important Update

The original notes include:

Calcitonin.

Calcitonin inhibits osteoclastic bone resorption, but it is no longer a major routine long-term treatment for osteoporosis because more effective fracture-prevention therapies are available.

It may have limited roles in selected situations, including short-term management of pain associated with some:

Acute vertebral compression fractures.

Therefore it should not be prioritised alongside modern first-line osteoporosis therapies.

49. Strontium Ranelate – Important Update

The original notes include:

Strontium ranelate.

This is now a limited or obsolete choice in many settings and is not a standard first-line osteoporosis treatment.

Its use became restricted because of safety concerns, particularly:

Cardiovascular and thromboembolic risks.

For modern study purposes, it is much more important to know:

Bisphosphonates.

Denosumab.

Anabolic therapy such as teriparatide.

and selected use of:

Romosozumab.

50. Osteoporosis – Causes in Note Form

PRIMARY OSTEOPOROSIS

Postmenopausal:

Oestrogen deficiency.

Accelerated bone resorption.

Particularly important effect on trabecular bone.

Age-related:

Ageing.

Reduced bone formation.

Altered remodelling.

Both cortical and trabecular bone affected.

SECONDARY – ENDOCRINE:

Premature menopause.

Hypogonadism.

Anorexia nervosa.

Cushing syndrome.

Hyperparathyroidism.

Hyperthyroidism.

SECONDARY – MALIGNANCY/HAEMATOLOGICAL:

Multiple myeloma.

Leukaemia and selected other malignancies.

SECONDARY – GI/NUTRITIONAL:

Malabsorption.

Coeliac disease.

Chronic liver disease.

Vitamin D/calcium deficiency where relevant.

SECONDARY – INFLAMMATORY:

Inflammatory bowel disease.

Rheumatoid arthritis.

Other chronic inflammatory disease.

SECONDARY – DRUGS:

Long-term systemic glucocorticoids – particularly important.

Long-term unfractionated heparin.

Aromatase inhibitors.

Androgen-deprivation therapy.

Selected antiseizure medications.

SECONDARY – LIFESTYLE/MECHANICAL:

Prolonged immobilisation.

Smoking.

Excessive alcohol.

Low body weight.

Physical inactivity.

51. Diagnosis – Note Form

Bone mineral density:

Measured by:

DXA.

T-score ≤ −2.5:

Diagnostic of osteoporosis in the appropriate population.

Fragility fracture:

May establish clinically important osteoporosis/high fracture risk irrespective of whether the DXA reaches −2.5, depending on the clinical setting.

Serum calcium:

Normal.

Serum phosphate:

Normal.

ALP:

Normal.

PTH:

Usually:

Normal.

Abnormal biochemical results should prompt investigation for:

Secondary metabolic bone disease.

52. Treatment – Note Form

GENERAL:

Treat the underlying cause.

Adequate calcium and vitamin D.

Weight-bearing/resistance exercise.

Stop smoking.

Avoid excessive alcohol.

Falls prevention.

ANTIRESORPTIVE TREATMENT:

Bisphosphonates.

Denosumab in appropriate patients.

ANABOLIC/BONE-FORMING TREATMENT IN SELECTED HIGH-RISK PATIENTS:

Teriparatide.

Romosozumab where appropriate.

OLDER TREATMENTS:

Calcitonin – limited role, not routine long-term first-line therapy.

Strontium ranelate – now limited/not routinely used in many settings because of safety concerns.

53. Important Clarifications to the Original Notes

The traditional distinction between:

Type I postmenopausal

and

Type II age-related osteoporosis

is useful educationally, but osteoporosis in older adults is usually multifactorial and the two processes often overlap.

The statement:

“Type II = decreased osteoblastic activity”

is somewhat too simple. Age-related osteoporosis reflects multiple changes in:

Bone formation, resorption, hormonal physiology, nutrition, muscle function and physical activity.

The original diagnostic statement is correct:

Ca²⁺, phosphate and ALP are usually normal in uncomplicated osteoporosis.

This is one of the most useful distinctions from:

Osteomalacia.

The treatment list needs modernisation.

Bisphosphonates remain highly important, but modern treatment also includes:

Denosumab, teriparatide and romosozumab in selected patients.

Calcitonin is no longer routine long-term therapy, and strontium ranelate has a very limited role in modern practice.

Key Clinical Pattern

For rapid recall:

OSTEOPOROSIS = REDUCED QUANTITY AND QUALITY OF NORMALLY MINERALISED BONE.

Therefore:

Ca²⁺ = NORMAL

PO₄³⁻ = NORMAL

ALP = NORMAL

PTH = usually NORMAL.

POSTMENOPAUSAL OSTEOPOROSIS:

↓ OESTROGEN → ↑ BONE RESORPTION → particularly trabecular bone loss.

AGE-RELATED OSTEOPOROSIS:

Ageing → impaired bone maintenance/remodelling → cortical + trabecular bone loss.

Think secondary osteoporosis when there is:

GLUCOCORTICOID USE + HYPOGONADISM + HYPERTHYROIDISM + HYPERPARATHYROIDISM + MALABSORPTION + CHRONIC INFLAMMATORY DISEASE + IMMOBILISATION + SMOKING + EXCESS ALCOHOL.

The major clinical consequence is:

FRAGILITY FRACTURE, particularly involving the:

HIP + VERTEBRAE + DISTAL RADIUS.

And the high-yield distinction is:

OSTEOPOROSIS → NORMAL Ca/PO₄/ALP.

OSTEOMALACIA → DEFECTIVE MINERALISATION, typically ↑ ALP with ↓ phosphate in vitamin D deficiency.

Medicine – Biochemical Patterns in Metabolic Bone and Parathyroid Disease

The image compares the characteristic changes in serum calcium (Ca²⁺), phosphate (PO₄³⁻), alkaline phosphatase (ALP), and parathyroid hormone (PTH) in several important metabolic bone and endocrine disorders.

These patterns are extremely useful for distinguishing primary hyperparathyroidism, hypoparathyroidism, osteoporosis, osteomalacia, Paget disease, and chronic kidney disease–mineral and bone disorder.

1. Primary Hyperparathyroidism

Primary hyperparathyroidism is caused by autonomous excessive secretion of PTH from one or more parathyroid glands.

The most common cause is:

Parathyroid adenoma.

Other causes include:

Multigland parathyroid hyperplasia

and, rarely:

Parathyroid carcinoma.

Biochemical Pattern

Calcium: ↑

Phosphate: ↓ or normal

ALP: ↑ or normal

PTH: ↑

Why Calcium Increases

PTH raises serum calcium through several mechanisms.

It increases:

Renal calcium reabsorption.

It stimulates renal production of:

Calcitriol – 1,25-dihydroxyvitamin D.

Calcitriol then increases intestinal calcium absorption.

PTH also increases bone turnover, indirectly stimulating osteoclastic bone resorption through osteoblast-lineage signalling.

Therefore:

↑ PTH → ↑ serum Ca²⁺.

Why Phosphate Falls

PTH decreases phosphate reabsorption in the:

Proximal renal tubule.

This produces:

Phosphaturia – increased urinary phosphate excretion.

Therefore:

↑ PTH → ↑ urinary PO₄³⁻ loss → ↓ serum phosphate.

This gives the classic pattern:

HIGH CALCIUM + LOW PHOSPHATE + HIGH PTH.

Why ALP May Increase

ALP reflects:

Osteoblastic activity and bone turnover.

In mild primary hyperparathyroidism, ALP may remain:

Normal.

With more substantial skeletal involvement and increased bone turnover:

ALP rises.

Therefore:

ALP = normal or ↑.

2. Hypoparathyroidism

Hypoparathyroidism results from:

Deficient PTH secretion.

A common acquired cause is damage to or removal of the parathyroid glands during:

Neck or thyroid surgery.

Other causes include autoimmune disease and genetic disorders.

Biochemical Pattern

Calcium: ↓

Phosphate: ↑

ALP: usually normal

PTH: ↓

Why Calcium Falls

With inadequate PTH:

Renal calcium reabsorption decreases

and

Calcitriol production decreases.

This reduces intestinal calcium absorption.

Therefore:

↓ PTH → ↓ serum Ca²⁺.

Why Phosphate Increases

Normally PTH promotes urinary phosphate excretion.

Without PTH:

Renal phosphate reabsorption increases.

Therefore phosphate accumulates:

↓ PTH → ↓ phosphaturia → ↑ serum phosphate.

Classic Pattern

Think:

HYPOPARATHYROIDISM

↓

LOW PTH

↓

LOW CALCIUM

• ●

HIGH PHOSPHATE.

This is almost the biochemical mirror image of primary hyperparathyroidism.

3. Osteoporosis

Osteoporosis is characterised by reduced bone mass and deterioration of bone microarchitecture, resulting in increased:

Bone fragility and fracture risk.

The bone is reduced in quantity, but its mineralisation is generally:

Normal.

This distinction explains the laboratory findings.

Biochemical Pattern

Calcium: Normal

Phosphate: Normal

ALP: Normal

PTH: Normal

Why Are the Blood Tests Normal?

Osteoporosis is not primarily a failure of mineralisation.

Instead, there is:

Reduced amount of normally mineralised bone.

Therefore routine calcium metabolism blood tests are usually:

Normal.

This is a very important examination point.

Key Osteoporosis Pattern

FRACTURE + LOW BONE DENSITY

with:

NORMAL Ca²⁺

NORMAL PO₄³⁻

NORMAL ALP

NORMAL PTH

suggests:

OSTEOPOROSIS.

Abnormal results should prompt investigation for secondary metabolic bone disease.

4. Osteomalacia

Osteomalacia is defective mineralisation of newly formed osteoid in adults.

In children, defective mineralisation involving growing bones is called:

Rickets.

A major cause is:

Vitamin D deficiency.

Typical Biochemical Pattern in Vitamin D Deficiency

Calcium: ↓ or sometimes normal

Phosphate: ↓

ALP: ↑

PTH: ↑

The image simplifies calcium as:

↓.

However, calcium may remain within the normal range because secondary hyperparathyroidism helps maintain serum calcium.

5. Why Calcium Falls in Osteomalacia

Vitamin D normally promotes intestinal absorption of:

Calcium

and

Phosphate.

Vitamin D deficiency therefore causes:

↓ intestinal calcium absorption.

The fall in calcium stimulates:

PTH secretion.

Therefore secondary hyperparathyroidism develops.

6. Why Phosphate Falls in Osteomalacia

Increased PTH attempts to preserve serum calcium.

However, PTH simultaneously causes:

Renal phosphate wasting.

Therefore:

Vitamin D deficiency

↓

↓ Ca²⁺ absorption

↓

↑ PTH

↓

↑ urinary phosphate excretion

↓

↓ serum phosphate.

7. Why ALP Rises in Osteomalacia

Defective mineralisation stimulates increased osteoblastic activity.

Therefore:

Bone ALP rises.

A high ALP is a particularly useful clue when distinguishing osteomalacia from uncomplicated osteoporosis.

Osteomalacia Pattern

Think:

LOW/LOW-NORMAL Ca²⁺

• ●

LOW PO₄³⁻

• ●

HIGH ALP

• ●

HIGH PTH

=

VITAMIN D DEFICIENCY OSTEOMALACIA in the appropriate clinical context.

8. Osteoporosis Versus Osteomalacia

This is an important distinction.

OSTEOPOROSIS:

There is too little bone, but remaining bone is normally mineralised.

Therefore:

Ca²⁺ normal.

PO₄³⁻ normal.

ALP usually normal.

PTH usually normal.

OSTEOMALACIA:

There is defective mineralisation of osteoid.

In typical vitamin D deficiency:

Ca²⁺ low or low-normal.

PO₄³⁻ low.

ALP high.

PTH high.

Therefore:

NORMAL BIOCHEMISTRY → think osteoporosis.

HIGH ALP + SECONDARY HYPERPARATHYROIDISM → think osteomalacia, depending on the cause.

9. Paget Disease of Bone

Paget disease of bone is characterised by markedly increased and disorganised:

Bone remodelling.

There is initially increased osteoclastic resorption followed by excessive osteoblastic bone formation.

The resulting bone may become:

Enlarged but structurally abnormal.

Biochemical Pattern

Calcium: Normal

Phosphate: Normal

ALP: ↑↑

PTH: Normal

This is one of the most characteristic patterns in the image.

10. Why ALP Is Very High in Paget Disease

Paget disease produces marked:

Osteoblastic activity.

Bone-specific alkaline phosphatase therefore rises substantially.

However, systemic calcium and phosphate homeostasis usually remains intact.

Therefore:

Ca²⁺ = normal

and

PO₄³⁻ = normal.

Classic Paget Pattern

NORMAL Ca²⁺

• ●

NORMAL PO₄³⁻

• ●

MARKEDLY HIGH ALP

=

THINK PAGET DISEASE.

If total ALP is elevated, liver disease should also be considered; liver enzymes or bone-specific ALP can help identify the source.

11. Clinical Features of Paget Disease

Many patients are:

Asymptomatic.

When symptomatic, possible features include:

Bone pain.

Bone deformity.

Increasing head size from skull involvement.

Hearing impairment.

Pathological fractures.

Secondary osteoarthritis.

Rarely, malignant transformation to osteosarcoma can occur.

12. Renal Failure / Chronic Kidney Disease

The image uses the older broad term:

Renal failure.

For this biochemical pattern, the more precise context is usually:

Advanced chronic kidney disease – CKD, particularly CKD–mineral and bone disorder.

Typical Biochemical Pattern

Calcium: ↓ or sometimes normal

Phosphate: ↑

ALP: ↑ or normal

PTH: ↑

This reflects:

Secondary hyperparathyroidism due to CKD.

13. Why Phosphate Rises in CKD

As GFR declines, the kidneys become progressively less able to excrete:

Phosphate.

Therefore phosphate retention develops.

In advanced disease:

↓ renal phosphate excretion → ↑ serum phosphate.

14. Why Calcium Falls in CKD

Diseased kidneys have reduced ability to convert vitamin D into its active form:

Calcitriol – 1,25-dihydroxyvitamin D.

Therefore:

↓ Calcitriol

↓

↓ Intestinal calcium absorption

↓

Tendency toward:

Hypocalcaemia.

Phosphate retention also contributes to disturbances in calcium balance.

15. Secondary Hyperparathyroidism in CKD

The combination of:

Phosphate retention

• ●

Reduced calcitriol

• ●

Low or low-normal calcium

stimulates the parathyroid glands.

Therefore:

PTH rises.

This is:

Secondary hyperparathyroidism.

16. Why ALP May Increase

Persistent secondary hyperparathyroidism can produce high-turnover bone disease:

Osteitis fibrosa.

Increased bone turnover causes:

ALP ↑.

However, CKD bone disease is heterogeneous, and patients with low-turnover adynamic bone disease may not have elevated ALP.

Therefore the image correctly gives:

ALP ↑ or normal.

17. CKD Pattern

Think:

ADVANCED CKD

↓

Phosphate retention

• ●

↓ Calcitriol

↓

↓/normal Ca²⁺

• ●

↑ PO₄³⁻

↓

↑ PTH

↓

Secondary hyperparathyroidism.

Therefore:

LOW/LOW-NORMAL Ca²⁺ + HIGH PO₄³⁻ + HIGH PTH → THINK CKD-RELATED SECONDARY HYPERPARATHYROIDISM.

18. Primary Versus Secondary Hyperparathyroidism

These two patterns are worth separating carefully.

PRIMARY HYPERPARATHYROIDISM:

PTH is autonomously increased.

Therefore:

PTH ↑

Ca²⁺ ↑

PO₄³⁻ ↓ or normal

ALP normal or ↑.

SECONDARY HYPERPARATHYROIDISM DUE TO CKD:

PTH rises appropriately in response to abnormal mineral metabolism.

Therefore:

PTH ↑

Ca²⁺ ↓ or normal

PO₄³⁻ ↑ in advanced CKD

ALP normal or ↑.

19. Vitamin D Deficiency Versus CKD

Both can cause:

Secondary hyperparathyroidism.

Therefore both may have:

↑ PTH

and

↑ ALP.

The phosphate helps distinguish the classic patterns.

VITAMIN D DEFICIENCY OSTEOMALACIA:

PO₄³⁻ ↓

because secondary hyperparathyroidism increases renal phosphate excretion.

ADVANCED CKD:

PO₄³⁻ ↑

because the kidneys cannot adequately excrete phosphate.

Therefore:

HIGH PTH + LOW PHOSPHATE → think vitamin D deficiency.

HIGH PTH + HIGH PHOSPHATE → think advanced CKD.

20. Biochemical Patterns – Copyable Note Form

PRIMARY HYPERPARATHYROIDISM

Calcium:

↑

Phosphate:

↓ or normal

ALP:

↑ or normal

PTH:

↑

Classic clue:

High calcium + high PTH.

HYPOPARATHYROIDISM

Calcium:

↓

Phosphate:

↑

ALP:

Normal

PTH:

↓

Classic clue:

Low calcium + high phosphate + low PTH.

OSTEOPOROSIS

Calcium:

Normal

Phosphate:

Normal

ALP:

Normal

PTH:

Normal

Classic clue:

Metabolic bone blood tests are usually normal.

OSTEOMALACIA – TYPICAL VITAMIN D DEFICIENCY

Calcium:

↓ or low-normal

Phosphate:

↓

ALP:

↑

PTH:

↑

Classic clue:

High ALP + low phosphate + secondary hyperparathyroidism.

PAGET DISEASE

Calcium:

Normal

Phosphate:

Normal

ALP:

↑↑

PTH:

Normal

Classic clue:

Isolated marked elevation of ALP with normal calcium and phosphate.

ADVANCED CKD / CKD-MINERAL AND BONE DISORDER

Calcium:

↓ or normal

Phosphate:

↑

ALP:

↑ or normal

PTH:

↑

Classic clue:

High phosphate + high PTH.

21. Important Clarifications to the Image

The image is useful for examination pattern recognition, but real patients do not always fit every arrow exactly.

In primary hyperparathyroidism, phosphate may be:

Low or low-normal, and ALP may remain normal in mild disease.

In vitamin D deficiency osteomalacia, calcium does not have to be frankly low. Secondary hyperparathyroidism may maintain it within the:

Low-normal or normal range.

The more useful pattern is:

Low phosphate + high ALP + high PTH.

In CKD, calcium and phosphate abnormalities depend on the stage of kidney disease and treatment. Serum phosphate may remain normal until more advanced CKD.

Therefore:

High phosphate + high PTH is particularly characteristic of more advanced CKD-related mineral disturbance.

Key Clinical Pattern

For rapid recall:

PRIMARY HYPERPARATHYROIDISM

Ca ↑ | PO₄ ↓ | PTH ↑

HYPOPARATHYROIDISM

Ca ↓ | PO₄ ↑ | PTH ↓

OSTEOPOROSIS

Ca N | PO₄ N | ALP N | PTH N

OSTEOMALACIA

Ca ↓/N | PO₄ ↓ | ALP ↑ | PTH ↑

PAGET DISEASE

Ca N | PO₄ N | ALP ↑↑ | PTH N

ADVANCED CKD

Ca ↓/N | PO₄ ↑ | ALP ↑/N | PTH ↑

The fastest high-yield associations are:

HIGH Ca + HIGH PTH → PRIMARY HYPERPARATHYROIDISM.

LOW Ca + HIGH PO₄ + LOW PTH → HYPOPARATHYROIDISM.

NORMAL EVERYTHING → OSTEOPOROSIS.

LOW PO₄ + HIGH ALP + HIGH PTH → OSTEOMALACIA/VITAMIN D DEFICIENCY.

NORMAL Ca/PO₄ + VERY HIGH ALP → PAGET DISEASE.

HIGH PO₄ + HIGH PTH + LOW/LOW-NORMAL Ca → ADVANCED CKD WITH SECONDARY HYPERPARATHYROIDISM.

Orthopaedic Surgery - Wrist Pain

Basics

Wrist pain is a common clinical complaint with many possible causes, including:

Trauma

Overuse

Degenerative disease

Inflammatory disease

Infection

and

Neurologic disorders.

A detailed history and focused physical examination are essential for establishing the:

Correct diagnosis

and selecting appropriate:

Treatment.

History

Important historical features include:

Onset

Duration

Frequency

and

Exact location of pain.

Additional symptoms should be documented, including:

Swelling

Erythema

Clicking or snapping

Loss of motion

Numbness or tingling

Weakness

and relationship to:

Specific activities.

General Medical History

Ask about conditions that may contribute to wrist disease, including:

Rheumatoid arthritis

Osteoarthritis

Gout

Diabetes

Immunosuppression

and previous:

Infection or trauma.

Classification

Wrist pain can broadly be classified as:

Traumatic

Inflammatory

Degenerative

Infectious

or

Neurologic.

Common Causes

Frequent causes include:

Fracture

Fracture nonunion

Arthritis

Tendinitis or tendinopathy

and

Ligament injury.

Epidemiology

Wrist pain is particularly common among:

Athletes

and individuals involved in repetitive:

Upper-extremity activity.

Athletes

Historical studies have reported wrist pain in approximately:

32–73% of young athletes

depending on the sport and population studied.

Emergency Department Visits

In the United States, wrist injuries have historically accounted for approximately:

2.5% of emergency department visits.

Pregnancy Considerations

Pregnant patients with wrist discomfort accompanied by:

Numbness

or

Tingling

should be evaluated for:

Carpal tunnel syndrome.

Fluid retention during pregnancy can increase pressure within the:

Carpal tunnel.

Associated Conditions

Systemic disorders associated with wrist pain include:

Rheumatoid arthritis

Osteoarthritis

Gout

and

Infection.

Diagnostic Approach

The location of pain is highly useful for narrowing the:

Differential diagnosis.

Wrist pain can be categorized anatomically as:

Radial-sided

Dorsal

Ulnar-sided

Volar or palmar

or

Diffuse.

Radial-Sided Wrist Pain

Important causes include:

de Quervain tenosynovitis

Intersection syndrome

Scaphoid fracture

Scapholunate ligament injury

Wartenberg syndrome

and

Thumb CMC or STT arthritis.

de Quervain Tenosynovitis

de Quervain disease is a stenosing tenosynovitis involving the:

First dorsal compartment.

The affected tendons are:

Abductor pollicis longus

and

Extensor pollicis brevis.

Typical History

Patients often report repetitive:

Thumb

or

Wrist activity.

Pain is localized near the:

Radial styloid.

Eichhoff / Finkelstein-Type Maneuver

With the thumb flexed into the palm and the wrist moved into:

Ulnar deviation

sharp pain over the first dorsal compartment supports the diagnosis.

The commonly performed thumb-in-fist maneuver is more accurately termed the:

Eichhoff test.

Alternative Provocative Testing

Wrist hyperflexion combined with thumb abduction may also reproduce:

First-compartment pain.

Intersection Syndrome

Intersection syndrome is an overuse disorder occurring where the:

First dorsal compartment tendons

cross the:

Second dorsal compartment tendons.

Location

Pain is typically located approximately:

4 cm proximal to the dorsal wrist.

Cause

It is usually associated with repetitive:

Wrist extension

and

Forearm motion.

Scaphoid Fracture

Patients typically report trauma, especially:

A fall on an outstretched hand.

Examination

Suggestive findings include tenderness at the:

Anatomic snuffbox

Scaphoid tubercle

and pain with:

Axial compression of the thumb ray.

Active thumb motion may also produce:

Pain.

Scapholunate Ligament Injury

Scapholunate ligament injury can produce:

Radial-dorsal wrist pain

and

Mechanical instability.

Watson Test

The:

Scaphoid shift or Watson test

is used to assess:

Scapholunate instability.

Pain, abnormal scaphoid translation, or a reproducible:

Clunk

may support the diagnosis.

Definitive Diagnosis

When uncertainty remains, wrist:

Arthroscopy

remains the most definitive method of directly evaluating the:

Scapholunate ligament.

Wartenberg Syndrome

Wartenberg syndrome results from irritation of the:

Superficial radial sensory nerve.

Cause

Mechanical compression can occur from:

Watches

Bracelets

or other constrictive objects.

Symptoms

Patients experience:

Burning

Numbness

or

Tingling

over the:

Dorsoradial wrist and hand.

Thumb CMC and STT Arthritis

Arthritis involving the:

First carpometacarpal joint

or

Scaphotrapeziotrapezoid joint

can cause radial-sided wrist pain.

Grind Test

A positive:

CMC grind test

supports symptomatic thumb:

CMC arthritis.

Dorsal Wrist Pain

Important causes include:

Extensor tenosynovitis

Ganglion cyst

and other dorsal:

Tendon or ligament disorders.

Extensor Tenosynovitis

Patients typically report:

Dorsal wrist pain

that may radiate:

Proximally

or

Distally.

Cause

The condition is often associated with:

Repetitive activity

and

Overuse.

Examination

Pain may occur with:

Wrist flexion

Wrist extension

and particularly:

Resisted extension.

Synovial Thickening

In some cases, thickened extensor synovium can be palpated during:

Wrist motion.

Ganglion Cyst

A ganglion cyst is the most common mass found on the:

Dorsal wrist.

Origin

Many dorsal ganglia arise near the:

Scapholunate ligament.

Examination

Ganglion cysts are often:

Mobile

and may:

Transilluminate.

Their size may change:

Over time.

Imaging of Ganglion Cyst

Diagnosis is usually clinical.

If uncertain, or if the lesion is in an unusual location,:

Ultrasound

or

MRI

may be useful.

Ulnar-Sided Wrist Pain

Important causes include:

Distal radioulnar joint instability or arthritis

FCU tendinopathy

ECU tendinopathy

Hook of hamate fracture

TFCC tear

Ulnocarpal impaction

and

Lunotriquetral ligament injury.

Distal Radioulnar Joint Instability

Pain is usually localized over the:

Distal radioulnar joint

and is worsened by:

Pronation

and

Supination.

DRUJ Examination

Instability may be assessed by translating the:

Ulna

relative to a stabilized:

Radius.

Piano-Key Sign

Abnormal mobility of the distal ulna may produce a:

Piano-key sign.

DRUJ Imaging

Radiographs may demonstrate abnormal:

Distal radioulnar spacing or alignment.

If radiographs are inconclusive,:

CT

can help evaluate:

DRUJ congruity and instability.

DRUJ Arthritis

Degenerative changes may include:

Joint-space narrowing

Subchondral sclerosis

and

Osteophytes.

Flexor Carpi Ulnaris Tendinopathy

FCU tendinopathy produces pain near the:

Volar-ulnar wrist.

Examination

Pain is typically reproduced by:

Resisted wrist flexion

and

Ulnar deviation.

Extensor Carpi Ulnaris Tendinopathy

ECU tendinopathy causes pain along the:

Dorsal-ulnar wrist.

Examination

Pain may be reproduced by resisted:

Ulnar deviation

particularly with the forearm in:

Supination.

Hook of Hamate Fracture

This injury is particularly important in athletes such as:

Golfers

and

Racquet-sport players.

Mechanism

The injury may result from direct pressure or impact through:

A club

Bat

or

Racquet handle

against the:

Ulnar palm.

Examination

Tenderness is present over the:

Hook of the hamate.

Pain may also be reproduced with resisted flexion of the:

Ring and small fingers.

Imaging

A:

Carpal tunnel view

or CT may be needed because standard radiographs may fail to show the:

Fracture.

TFCC Tear

A triangular fibrocartilage complex tear typically causes:

Ulnar-sided wrist pain

often accompanied by:

Clicking.

TFCC Provocative Test

Pain may be reproduced by:

Axial loading

while rotating an:

Ulnar-deviated wrist.

Ulnocarpal Impaction

Ulnocarpal impaction syndrome causes pain with:

Grip

particularly when the forearm is:

Pronated.

Ulnar Variance

The condition is more common when there is:

Positive ulnar variance.

Lunotriquetral Ligament Injury

Lunotriquetral ligament injury may produce:

Ulnar-sided wrist pain

and

Instability.

LT Shuck Test

The lunate and triquetrum are moved in opposite directions.

Findings such as:

Pain

Crepitus

or excessive:

Translation

support an LT ligament injury.

Volar Wrist Pain

Common causes include:

Flexor tenosynovitis

Carpal tunnel syndrome

and

Volar ganglion cyst.

Flexor Tenosynovitis

Patients usually describe:

Palmar wrist pain

associated with repetitive:

Overuse.

Examination

Pain is worsened by:

Wrist motion

and

Resisted wrist flexion.

Symptoms may radiate:

Proximally

or

Distally.

Carpal Tunnel Syndrome

CTS is the most common:

Compression neuropathy of the upper extremity.

Symptoms

Patients may report:

Wrist discomfort

Numbness

Tingling

Clumsiness

and

Weakness.

Sensory Distribution

Symptoms typically involve the:

Thumb

Index finger

Middle finger

and

Radial half of the ring finger.

Nocturnal Symptoms

Patients frequently awaken at night with:

Numbness or paresthesias.

Provocative Tests

Useful maneuvers include:

Tinel sign

Phalen test

and

Flexion-compression testing.

Late CTS Findings

Advanced median neuropathy may produce:

Reduced sensation

and

Thenar atrophy.

Generalized Wrist Pain

Diffuse pain may result from:

Osteoarthritis

Inflammatory arthritis

or

Infection.

Osteoarthritis

Degenerative arthritis may affect the:

Radiocarpal

Intercarpal

or

CMC joints.

History

Patients may have a history of:

Previous trauma

or longstanding:

Degeneration.

Examination

Typical findings include:

Pain

Stiffness

Swelling

and

Reduced range of motion.

Osteoarthritis Radiographs

Common findings include:

Joint-space narrowing

Subchondral sclerosis

and

Osteophyte formation.

Inflammatory Arthritis

Inflammatory disorders such as:

Rheumatoid arthritis

may cause:

Synovitis

Tendon-sheath swelling

and later:

Joint deformity.

Inflammatory Arthritis Radiographs

Possible findings include:

Joint-space narrowing

Periarticular osteopenia

Bone erosions

and

Deformity.

Wrist Infection

Septic arthritis of the:

Radiocarpal joint

is uncommon but potentially destructive.

Risk Factors

Risk is increased in:

Immunocompromised patients

and individuals with a history of:

Intravenous drug use.

Signs of Infection

Possible findings include:

Severe pain

Swelling

Erythema

Warmth

and

Marked reduction in motion.

Pain With Motion

Severe pain with:

Passive and active wrist motion

is particularly concerning for:

Septic arthritis.

Laboratory Findings

Possible abnormalities include elevated:

White blood cell count

ESR

and

CRP.

Normal serum tests do not completely exclude:

Infection.

Joint Aspiration

When septic arthritis is suspected, the joint should be:

Aspirated urgently.

Synovial fluid should be sent for:

Cell count

Differential

Gram stain

and

Culture.

Synovial WBC

A very high synovial leukocyte count with a predominance of:

Neutrophils

strongly supports infection.

Historical thresholds such as:

>80,000 cells/µL with >75% polymorphonuclear cells

have been described, but no single value alone confirms or excludes:

Septic arthritis.

Laboratory Tests

Laboratory evaluation is most useful when:

Infection

or systemic inflammatory disease is suspected.

Infection Markers

Obtain:

CBC

ESR

and

CRP

when evaluating possible:

Septic arthritis.

Imaging

Plain Radiographs

Initial imaging usually includes:

PA

Lateral

and

Oblique wrist radiographs.

Scaphoid View

A dedicated:

Scaphoid view

is useful when a:

Scaphoid fracture

is suspected.

Carpal Tunnel View

A:

Carpal tunnel view

can improve visualization of the:

Hook of hamate.

MRI

MRI, preferably with high-resolution technique, may be useful for suspected:

TFCC

Scapholunate

or

Lunotriquetral ligament tears.

Limitations of MRI

MRI findings should be interpreted in combination with:

History

and

Physical examination

because incidental abnormalities can occur.

Differential Diagnosis

Radial-Sided Pain

Consider:

de Quervain tenosynovitis

Scaphoid fracture or nonunion

Scapholunate ligament injury

Thumb CMC arthritis

STT arthritis

Radiocarpal arthritis

and

Wartenberg syndrome.

Dorsal Pain

Consider:

Extensor tenosynovitis

Ganglion cyst

and

ECU tendinopathy.

Ulnar-Sided Pain

Consider:

DRUJ instability

FCU tendinopathy

ECU tendinopathy

Hook of hamate fracture

TFCC tear

Ulnocarpal impaction

and

Lunotriquetral ligament injury.

Volar Pain

Consider:

Flexor tenosynovitis

Carpal tunnel syndrome

and

Volar ganglion cyst.

Generalized Pain

Consider:

Osteoarthritis

Inflammatory arthritis

and

Infection.

Treatment

Treatment depends entirely on the:

Underlying diagnosis.

Tendinitis and Tenosynovitis

Initial treatment may include:

Rest

Activity modification

Cold therapy

Immobilization

and

NSAIDs.

Corticosteroid Injection

Selected persistent tendon-sheath disorders may benefit from:

Local corticosteroid injection.

Nondisplaced Fractures

Stable nondisplaced fractures are generally treated with:

Immobilization

and appropriate:

Analgesia.

Rheumatoid Arthritis

Rheumatoid wrist disease requires treatment of the underlying systemic:

Inflammatory disorder.

Management should be coordinated with a:

Rheumatologist.

Ganglion Cyst

Observation is appropriate for many asymptomatic:

Ganglion cysts.

Aspiration

Dorsal ganglia may be:

Aspirated

but recurrence is:

Common.

Excision

Surgical excision generally has a lower recurrence rate than:

Aspiration

but still carries risks of:

Stiffness

scar sensitivity

and

Recurrence.

Carpal Tunnel Syndrome

Mild to moderate CTS can initially be treated with:

Neutral-position wrist splinting

Activity modification

and selected:

Corticosteroid injection.

Role of Injection

Steroid injection may provide substantial:

Temporary symptom relief

and can delay or occasionally avoid:

Surgery.

It does not reliably provide permanent cure in all:

Patients.

Wrist Infection

Suspected septic wrist requires urgent:

Hospital-based treatment.

Aspiration and Cultures

Synovial fluid should be obtained for:

Gram stain

and

Culture

before antibiotics whenever this can be performed without delaying:

Treatment.

Antibiotics

After cultures are obtained,:

Intravenous antibiotics

should be started promptly.

Surgical Drainage

Many septic wrists require:

Arthroscopic or open irrigation and debridement.

Serial Aspiration

Repeated aspiration may be appropriate in selected:

Patients

when adequate drainage can be achieved and close monitoring is:

Available.

Rehabilitation After Infection

Once infection is controlled, early:

Range of motion

is important to minimize:

Joint stiffness.

Medication

First-line medication depends on the diagnosis.

Possible therapies include:

NSAIDs

Local corticosteroid injection

and

Intravenous antibiotics

for septic arthritis.

Surgery

Operative treatment is reserved for specific:

Structural or refractory conditions.

de Quervain Surgery

Persistent de Quervain disease despite adequate nonoperative management may require:

First dorsal compartment release.

Scaphoid Fracture Surgery

Displaced scaphoid fractures commonly require:

Internal fixation.

Selected nondisplaced fractures may be treated with:

Cast immobilization

or

Internal fixation

depending on location, patient factors, and functional demands.

DRUJ Instability

Persistent DRUJ instability may require:

Arthroscopy

TFCC repair

or open:

Reconstruction.

Fracture-Associated DRUJ Instability

If instability accompanies fractures of the:

Distal radius

or

Ulna

fracture fixation may be required.

Temporary:

DRUJ pinning

may be used in selected unstable injuries.

Hook of Hamate Fracture

Hook fractures have a relatively high risk of:

Nonunion.

Small Hook Fragment

A persistently symptomatic small fragment may be treated with:

Surgical excision.

Base Fracture

A fracture through the base of the hook may be treated with:

Open reduction and internal fixation

when appropriate.

Flexor Tenosynovitis

Chronic refractory flexor tendon adhesions or mechanical restriction may occasionally require:

Tenolysis

although treatment depends on the specific:

Pathology.

Carpal Tunnel Release

Surgical decompression is considered when:

Nonoperative treatment fails

or when advanced median nerve dysfunction is present.

Advanced CTS Findings

Indications include:

Persistent sensory loss

Thenar weakness or atrophy

and significant abnormalities on:

Nerve conduction studies or EMG.

Arthritis Surgery

Severe wrist arthritis that does not respond to conservative care may require:

Arthroplasty

Resection procedures

or

Partial or total wrist fusion.

Follow-Up

Follow-up is determined by:

Diagnosis

Treatment

and progression of:

Symptoms.

Prognosis

Most causes of wrist pain can be substantially improved when the underlying disorder is:

Correctly identified

and treated appropriately.

Clinical Summary

First step: Localize the pain as radial, dorsal, ulnar, volar, or diffuse.

Radial pain: Think de Quervain disease, scaphoid fracture, scapholunate injury, CMC/STT arthritis, and Wartenberg syndrome.

Dorsal pain: Common causes include extensor tenosynovitis and ganglion cyst.

Ulnar pain: Consider TFCC tear, DRUJ pathology, ECU/FCU tendinopathy, hook of hamate fracture, ulnocarpal impaction, and lunotriquetral injury.

Volar pain: Common causes are flexor tenosynovitis and carpal tunnel syndrome.

Diffuse pain: Consider osteoarthritis, inflammatory arthritis, and infection.

Imaging: Begin with PA, lateral, and oblique wrist radiographs; add scaphoid, carpal tunnel, CT, or MRI views as dictated by the suspected diagnosis.

Red flag: Severe pain with passive motion, swelling, warmth, erythema, or systemic illness should raise concern for septic arthritis and prompt urgent aspiration and treatment.

Treatment: Most diagnoses begin with activity modification, immobilization, analgesia, and diagnosis-specific therapy, while surgery is reserved for unstable, displaced, compressive, infectious, or refractory pathology.

Key Principle

Wrist pain is a symptom rather than a diagnosis, and the most useful first step is careful:

Anatomic localization.

Radial, dorsal, ulnar, volar, and generalized pain patterns each have characteristic:

Differential diagnoses and provocative findings.

A thorough examination should assess:

Tenderness, motion, tendon function, ligament stability, nerve symptoms, and joint inflammation.

Plain radiographs are the initial imaging study for most patients, while:

CT

MRI

or

Arthroscopy

may be required for selected fractures, ligament injuries, or unclear diagnoses.

Urgent recognition of:

Infection, unstable fracture, neurovascular compromise, or advanced nerve compression

is essential to prevent long-term:

Loss of wrist and hand function.

Orthopaedic Surgery - Wrist Anatomy and Exam

Basics

The wrist is a complex articulation formed by:

Eight carpal bones

arranged in:

Two rows.

These bones provide mobility while maintaining stability between the:

Forearm

and

Hand.

Carpal Bones

From radial to ulnar, the:

Proximal carpal row

contains:

Scaphoid

Lunate

Triquetrum

and

Pisiform.

Distal Carpal Row

From radial to ulnar, the:

Distal carpal row

contains:

Trapezium

Trapezoid

Capitate

and

Hamate.

Dorsal Extensor Compartments

The dorsal wrist contains:

Six extensor compartments

that transmit the extensor tendons from the forearm into the:

Hand and digits.

First Dorsal Compartment

The first and most radial compartment contains:

Abductor pollicis longus

and

Extensor pollicis brevis.

Clinical Significance of the First Compartment

These tendons form the:

Radial border of the anatomic snuffbox.

Stenosing tenosynovitis of this compartment produces:

de Quervain tenosynovitis.

de Quervain Tenosynovitis

In de Quervain disease, thickening and irritation of the first dorsal compartment restrict smooth tendon gliding and produce:

Radial-sided wrist pain

especially with:

Thumb motion

and

Ulnar deviation.

Second Dorsal Compartment

The second compartment lies radial to:

Lister tubercle

and contains:

Extensor carpi radialis longus

and

Extensor carpi radialis brevis.

Third Dorsal Compartment

The third compartment passes around the ulnar side of:

Lister tubercle

and contains:

Extensor pollicis longus.

Anatomic Snuffbox

The extensor pollicis longus forms the:

Ulnar border of the anatomic snuffbox.

The first dorsal compartment tendons form its:

Radial border.

EPL Rupture

The extensor pollicis longus may rupture in association with:

Rheumatoid arthritis

or following selected:

Distal radius fractures.

Fourth Dorsal Compartment

The fourth compartment lies just ulnar to the third and contains:

Four extensor digitorum tendons

and

Extensor indicis proprius.

Posterior Interosseous Nerve

The terminal posterior interosseous nerve lies deep to the extensor tendons in this region and contributes predominantly:

Articular sensory fibers

near the dorsal wrist.

Fifth Dorsal Compartment

The fifth compartment overlies the distal:

Radioulnar joint

and contains:

Extensor digiti minimi.

Sixth Dorsal Compartment

The sixth compartment contains:

Extensor carpi ulnaris.

It lies adjacent to the:

Ulnar head

and

Ulnar styloid.

ECU Abnormality

The ECU tendon may become:

Inflamed

Subluxated

or

Ruptured.

In rheumatoid arthritis, attritional tendon injury may occur because of:

Distal radioulnar joint disease.

Volar Wrist Compartments

Important volar passages include the:

Carpal tunnel

and

Guyon canal.

These transport major:

Tendons

Nerves

and

Vessels

into the hand.

Diagnosis

Symptoms involving the wrist may originate locally or may be:

Referred from more proximal structures.

Referred Pain

Potential sources include:

Cervical disc disease

Cervical osteoarthritis

Brachial plexus disorders

and entrapment syndromes involving the:

Elbow

or

Shoulder region.

Pregnancy Considerations

Pregnancy is associated with an increased incidence of:

Carpal tunnel syndrome

because of:

Fluid retention

and increased pressure within the:

Carpal tunnel.

Postpartum de Quervain Disease

New mothers also have an increased incidence of:

de Quervain tenosynovitis

often associated with repetitive lifting and positioning of:

Infants.

History

A complete history should include:

Age

Hand dominance

Occupation

Sports or recreational activities

and previous:

Wrist injury or surgery.

Chief Complaint

Clarify whether the major problem is:

Pain

Weakness

Numbness

Stiffness

Instability

Clicking

or

Swelling.

Mechanism of Injury

For traumatic complaints, determine:

Direction of force

Position of the wrist

and whether the mechanism involved:

Fall

Twisting

Direct impact

or

Axial loading.

Symptom Characterization

Ask about:

Onset

Duration

Frequency

Activity relationship

Exacerbating factors

Relieving factors

and whether symptoms are worse:

At night

or during the:

Day.

Occupational History

Document:

Work demands

Current work status

and any relevant:

Workers’ compensation considerations.

Physical Examination

Examine both upper extremities whenever possible because:

Side-to-side comparison

is extremely useful.

General Observation

Observe spontaneous use of the hand and wrist during:

Conversation

Undressing

and routine:

Movement.

Smooth spontaneous motion suggests different pathology from guarded, stiff, or:

Jerky movement.

Entire Upper Extremity Examination

Because symptoms may be referred, the examination should include the:

Cervical spine

Shoulder

Elbow

Forearm

Wrist

and

Hand.

Skin Examination

Inspect for:

Warmth

Dryness

Swelling

Scars

Hair loss

and other skin:

Changes.

Warmth

Marked localized warmth may suggest:

Inflammation

or

Infection.

Anhidrosis

Abnormally dry skin may reflect impaired:

Autonomic nerve function.

Bony Palpation

Systematic palpation should include:

Radial styloid

Anatomic snuffbox

Scaphoid

Trapezium

Capitate

Lunate

Ulnar styloid

Triquetrum

Pisiform

and

Hook of the hamate.

Radial Styloid

The radial styloid is located at the distal:

Radial aspect of the wrist.

Tenderness here may occur with:

Radial styloid fracture

or nearby:

First-compartment tendon disease.

Anatomic Snuffbox

The anatomic snuffbox is the depression just distal and dorsal to the:

Radial styloid.

It becomes more obvious when the patient extends the:

Thumb.

Scaphoid

The scaphoid forms the floor of the:

Anatomic snuffbox.

It is the:

Most commonly fractured carpal bone.

Snuffbox Tenderness

Tenderness in the snuffbox after trauma raises concern for:

Scaphoid fracture.

A normal initial radiograph does not completely exclude this:

Diagnosis.

Trapezium

The trapezium lies radially and articulates with the:

First metacarpal

to form the thumb:

CMC joint.

Thumb CMC Arthritis

The thumb CMC joint is a common site of:

Osteoarthritis.

CMC Grind Test

The grind test evaluates for symptomatic:

First CMC arthritis.

The examiner stabilizes the trapezium and applies:

Axial compression

through the first metacarpal while rotating or translating the:

Metacarpal base.

Positive Grind Test

Reproduction of:

Pain

or

Crepitus

supports symptomatic:

CMC degeneration.

Capitate

The capitate is the:

Largest carpal bone.

It lies immediately proximal to the base of the:

Third metacarpal.

Lunate

The lunate lies proximal to the:

Capitate

and articulates proximally with the:

Radius.

Lunate Injury

The lunate is commonly involved in:

Perilunate and lunate dislocations

and may also sustain:

Fracture or osteonecrosis.

Central Wrist Alignment

The:

Third metacarpal

Capitate

and

Lunate

normally align along the central axis of the:

Wrist.

ECRB Relationship

The:

Extensor carpi radialis brevis

inserts at the base of the:

Third metacarpal.

Ulnar Styloid

The ulnar styloid is palpable at the distal:

Ulna.

The ECU tendon passes nearby in a groove along the:

Distal ulna.

Triquetrum

The triquetrum lies distal to the:

Ulnar styloid

within the proximal:

Carpal row.

Pisiform

The pisiform is a sesamoid bone contained within the:

Flexor carpi ulnaris tendon.

Guyon Canal

The pisiform forms the:

Ulnar border

of the entrance to:

Guyon canal.

Hook of Hamate

The hook of the hamate lies distal and radial to the:

Pisiform.

It forms the:

Radial border

of Guyon canal.

Contents of Guyon Canal

Guyon canal transmits the:

Ulnar nerve

and

Ulnar artery

into the hand.

Palmar Wrist Examination

Important structures on the volar wrist include:

Palmaris longus

Carpal tunnel

Flexor carpi radialis

and the:

Radial and ulnar arteries.

Palmaris Longus

The palmaris longus tendon, when present, lies superficially near the:

Midline of the volar wrist.

It is congenitally absent in a substantial proportion of:

Individuals.

Palmaris Longus Examination

To make the tendon prominent, ask the patient to:

Oppose the thumb and small finger

while lightly flexing the:

Wrist.

Carpal Tunnel

The carpal tunnel is a:

Fibro-osseous canal

on the volar side of the wrist.

Carpal Tunnel Boundaries

Its floor and walls are formed by the:

Carpal bones

while the roof is formed by the:

Transverse carpal ligament.

Carpal Tunnel Landmarks

Proximally, important landmarks include the:

Pisiform

and

Scaphoid tubercle.

Distally, the ligament attaches near the:

Hook of hamate

and

Trapezial tubercle.

Carpal Tunnel Contents

The tunnel contains the:

Median nerve

and

Nine flexor tendons

consisting of:

Four FDS tendons

Four FDP tendons

and

Flexor pollicis longus.

Carpal Tunnel Syndrome

Compression of the median nerve within this tunnel produces:

Carpal tunnel syndrome.

Sensory Symptoms

Patients typically experience numbness or paresthesias involving the:

Thumb

Index finger

Middle finger

and

Radial half of the ring finger.

Nocturnal Symptoms

Symptoms frequently worsen:

At night.

Motor Effects

Advanced compression may produce:

Thenar weakness

and, in severe cases,

Thenar atrophy.

Tinel Sign

Percussion over the median nerve at the volar wrist may produce:

Tingling or electrical sensations

in the median nerve:

Distribution.

Phalen Test

The Phalen maneuver involves maintaining maximal:

Wrist flexion

to provoke median nerve:

Paresthesias.

Flexion-Compression Test

Adding direct pressure over the:

Carpal tunnel

during wrist flexion may reproduce symptoms more quickly.

Symptoms developing within approximately:

30–60 seconds

support:

Median neuropathy at the wrist.

Flexor Carpi Radialis

The FCR tendon travels along the:

Radial volar wrist

and inserts primarily at the base of the:

Second metacarpal.

FCR Tendinitis

FCR tendinopathy may produce pain along the:

Volar-radial wrist.

FCR Examination

Pain may be reproduced by:

Palpation of the FCR tunnel

Resisted wrist flexion

and

Resisted radial deviation.

Radial Artery

The radial artery is palpable just radial to the:

Flexor carpi radialis tendon.

Ulnar Artery

The ulnar artery can be palpated near the:

Pisiform

as it enters the:

Hand.

Vascular Dominance

The relative contribution of the radial and ulnar arteries varies between:

Individuals.

Before procedures that may compromise one vessel, collateral circulation should be assessed when:

Clinically relevant.

Range of Motion

Range of motion should be evaluated first:

Actively

and then:

Passively.

Wrist Flexion

Normal wrist flexion is approximately:

70–80°.

Wrist Extension

Normal wrist extension is approximately:

70–80°.

Radial Deviation

Normal radial deviation is approximately:

20°.

Ulnar Deviation

Normal ulnar deviation is approximately:

30°.

Supination

Normal forearm supination is approximately:

90°.

Pronation

Normal forearm pronation is approximately:

90°.

Neurologic Examination

The neurologic examination should evaluate both:

Motor function

and

Sensation.

Motor Testing

Important myotomal functions include:

Wrist extension — predominantly C6

Wrist flexion — predominantly C7

Supination — C5–C6

and

Pronation — primarily C6–C7 with contributions from lower roots depending on the muscle tested.

Peripheral Nerve Examination

Test motor and sensory function of the:

Median nerve

Ulnar nerve

and

Radial nerve.

Sensory Testing

Useful autonomous sensory regions include:

Median nerve — volar index fingertip

Ulnar nerve — small fingertip

and

Radial nerve — dorsal first web space.

Provocative Maneuvers

Special tests help localize pathology involving:

Tendons

Ligaments

and

Peripheral nerves.

Finkelstein and Eichhoff Maneuvers

These maneuvers are used to assess:

de Quervain tenosynovitis.

Eichhoff Test

The commonly performed maneuver in which the patient places the thumb inside a closed fist and the examiner ulnarly deviates the wrist is more accurately called the:

Eichhoff test.

Positive Test

Sharp pain over the:

First dorsal compartment

supports the diagnosis of:

de Quervain tenosynovitis.

Scaphoid Shift Test

The:

Scaphoid shift test

also called the:

Watson test

assesses integrity of the:

Scapholunate ligament.

Watson Test Technique

The wrist begins in:

Ulnar deviation

and slight:

Extension.

The examiner places the thumb over the:

Scaphoid tubercle

and applies dorsal pressure while moving the wrist toward:

Radial deviation.

Positive Watson Test

With scapholunate ligament insufficiency, the scaphoid may:

Sublux dorsally

producing:

Pain

or a palpable:

Clunk.

Bilateral Comparison

Because some asymptomatic individuals have a positive maneuver, the test should be compared with the:

Contralateral wrist.

Midcarpal Shift Test

The midcarpal shift test evaluates for:

Midcarpal instability.

Technique

The forearm is stabilized in:

Pronation.

A volarly directed force is applied over the:

Capitate

while axially loading the wrist and moving it toward:

Ulnar deviation.

Positive Midcarpal Shift

A painful or reproducible:

Clunk

suggests:

Midcarpal instability.

Dorsal Midcarpal Translation

Dorsal translation of the capitate relative to the:

Lunate

may also be compared with the opposite:

Wrist.

Tinel Sign Elsewhere

Tinel testing can be performed over any accessible:

Peripheral nerve.

For example, percussion over the:

Ulnar nerve at the elbow

may reproduce symptoms in the:

Ulnar nerve distribution.

Imaging

Standard Radiographs

A standard wrist series should include at least:

Posteroanterior

Lateral

and

Oblique views.

Scaphoid View

A dedicated:

Scaphoid view

with the wrist in:

Ulnar deviation

can improve visualization of:

Scaphoid fractures.

Clenched-Fist View

A:

Clenched-fist stress view

can accentuate widening of the:

Scapholunate interval.

Comparison with the opposite wrist may be helpful when evaluating suspected:

Scapholunate ligament injury.

Occult Scaphoid Fracture

Scaphoid fractures may not be visible on initial:

Radiographs.

If clinical suspicion remains high, further evaluation may include:

Repeat radiographs

or

Advanced imaging.

Repeat Radiographs

Historically, repeat radiographs were often obtained after approximately:

7–10 days.

MRI or CT may establish the diagnosis:

Earlier.

Gilula Arcs

On a normal PA wrist radiograph, three smooth arcs known as:

Gilula lines

should be preserved.

First Gilula Arc

The first arc follows the proximal convex surfaces of the:

Scaphoid

Lunate

and

Triquetrum.

Second Gilula Arc

The second follows the distal concave surfaces of the:

Scaphoid

Lunate

and

Triquetrum.

Third Gilula Arc

The third follows the proximal surfaces of the:

Capitate

and

Hamate.

Disruption of Gilula Lines

Loss of these smooth arcs suggests:

Carpal malalignment

Fracture

or

Dislocation.

CT

CT is especially useful for:

Complex fracture assessment

and

Preoperative planning.

MRI

MRI is useful for evaluating:

Ligament tears

Tendon abnormalities

Occult fractures

Avascular necrosis

and

Soft-tissue masses.

Grip Strength

Grip strength provides an objective measure of:

Hand function.

It should be compared with the:

Contralateral side.

Pinch Strength

Pinch strength may also be measured serially to assess:

Thumb and hand function.

Clinical Summary

Key anatomy: The wrist contains 8 carpal bones in two rows and 6 dorsal extensor compartments.

Important landmarks: The scaphoid forms the floor of the anatomic snuffbox, the pisiform and hook of hamate border Guyon canal, and the transverse carpal ligament forms the roof of the carpal tunnel.

Carpal tunnel contents: The median nerve plus 9 flexor tendons.

Typical ROM: Flexion and extension about 70–80°, radial deviation about 20°, ulnar deviation about 30°, and pronation/supination about 90° each.

Key provocative tests: Eichhoff/Finkelstein for de Quervain disease, Watson scaphoid shift for scapholunate instability, midcarpal shift for midcarpal instability, and Phalen, flexion-compression, and Tinel for carpal tunnel syndrome.

Scaphoid concern: Snuffbox tenderness after trauma should raise suspicion for a scaphoid fracture, even if initial radiographs are normal.

Imaging: Standard wrist radiographs include PA, lateral, and oblique views; special views and CT or MRI are added according to suspected pathology.

Radiographic alignment: The three Gilula arcs should remain smooth and continuous; disruption suggests carpal injury or instability.

Key Principle

A systematic wrist examination should proceed from:

Inspection and palpation

to

Range of motion, neurologic testing, provocative maneuvers, and imaging.

The examiner should understand the relationships among the:

Carpal bones

Extensor compartments

Carpal tunnel

Guyon canal

and

Major neurovascular structures.

Because wrist symptoms may be referred from the:

Cervical spine, shoulder, elbow, or forearm, the entire upper extremity should be examined when the diagnosis is uncertain.

Accurate localization of:

Tenderness, instability, tendon pathology, nerve symptoms, and radiographic alignment

is the foundation of diagnosing common wrist disorders.

Orthopaedic Surgery - Vertical Talus

⸻

Basics

Congenital vertical talus is a rigid congenital foot deformity caused primarily by:

Dorsolateral dislocation of the talonavicular joint.

The deformity produces:

Hindfoot equinus

Forefoot dorsiflexion

Midfoot abduction

and contracture of several:

Tendons and soft-tissue structures.

⸻

Synonyms

Congenital vertical talus is also called:

Congenital convex pes planus

or

Congenital rocker-bottom foot.

⸻

Laterality

The condition may be:

Unilateral

or

Bilateral.

⸻

Associated Disorders

Approximately half of affected patients have an associated:

Neurologic

Genetic

or

Connective-tissue disorder.

⸻

Natural History

The deformity usually develops:

In utero.

An exception may occur in some:

Neurologic disorders

where abnormal muscle balance can produce or worsen the deformity after birth.

Without treatment, the foot generally becomes increasingly:

Rigid

with age.

⸻

Epidemiology

Congenital vertical talus is:

Rare

but has a strong association with other congenital and neurologic:

Conditions.

⸻

Myelomeningocele

Approximately:

5% of children with myelomeningocele

have been reported to develop:

Vertical talus.

⸻

Other Syndromic Associations

The deformity may occur in:

Larsen syndrome

Arthrogryposis

and selected chromosomal disorders.

⸻

Chromosomal Associations

Reported associations include:

Trisomy 13

Trisomy 18

and other:

Chromosomal abnormalities.

⸻

Sex

Boys and girls are affected approximately:

Equally.

⸻

Genetics

Most idiopathic cases are:

Sporadic.

⸻

Familial Cases

Rare familial cases have demonstrated:

Autosomal dominant inheritance

with:

Incomplete penetrance.

⸻

Pathophysiology

The deformity is thought to result from an imbalance between:

Forefoot dorsiflexors

and

Hindfoot plantarflexors.

This imbalance disrupts alignment through the:

Talonavicular joint.

⸻

Ligamentous Laxity

In some children, generalized:

Ligamentous laxity

may contribute to the deformity.

⸻

Structural Changes

The talonavicular joint becomes:

Fixed in dorsal dislocation.

At the same time:

The hindfoot remains in equinus and valgus

while the:

Forefoot is dorsiflexed and abducted.

⸻

Pathological Findings

The muscles and bones are usually structurally:

Normal on histologic examination.

The major abnormality is one of:

Alignment

and

Soft-tissue contracture.

⸻

Associated Conditions

Important associated disorders include:

Arthrogryposis

Myelomeningocele

Larsen syndrome

and

Chromosomal abnormalities.

⸻

Diagnosis

Diagnosis is based on:

Clinical examination

and

Specialized radiographs.

⸻

Signs and Symptoms

Infants are usually initially:

Asymptomatic.

⸻

Symptoms After Walking Begins

If untreated, pressure abnormalities may eventually produce:

Painful plantar calluses

and

Skin irritation.

⸻

Push-Off Dysfunction

Because the foot becomes rounded and mechanically inefficient, patients may have reduced:

Push-off strength

during gait.

⸻

Reversed Arch

The normal longitudinal arch becomes:

Reversed.

The plantar surface therefore appears:

Convex

rather than concave.

⸻

Dorsal Crease

A characteristic:

Deep dorsal crease

may be visible across the:

Midfoot.

⸻

Physical Examination

Examine the entire child rather than focusing only on the:

Foot.

⸻

Screening for Associated Abnormalities

The examination should include:

Spine

Hips

Knees

and

Other extremities

for associated congenital or neurologic:

Abnormalities.

⸻

Strength Examination

Assess motor strength in both:

Lower extremities.

This is particularly important when a:

Neurologic cause

is suspected.

⸻

Standing and Gait

If the child is old enough to walk, observe:

Standing alignment

and

Gait.

⸻

Rocker-Bottom Appearance

The sole of the foot is characteristically:

Convex.

This produces the classic:

Rocker-bottom deformity.

⸻

Hindfoot Equinus

The heel is fixed in:

Equinus

because of shortening of the:

Achilles tendon.

⸻

Hindfoot Valgus

The hindfoot is positioned in:

Valgus.

⸻

Talar Head Prominence

The head of the talus becomes prominent on the:

Medial plantar aspect of the foot.

It may be readily:

Palpable.

⸻

Forefoot Position

The forefoot is:

Abducted

and

Dorsiflexed

through the:

Midtarsal region.

⸻

Increasing Visibility With Age

As subcutaneous fat decreases with age, the characteristic deformity becomes increasingly:

Obvious.

⸻

Distinguishing From Flexible Deformities

True vertical talus is rigid and must be differentiated from:

Calcaneovalgus foot

and

Flexible flatfoot.

⸻

Imaging

⸻

Plain Radiographs

Radiography is essential for confirming the:

Rigid talonavicular dislocation.

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Lateral Radiograph

On the lateral view, the talus is:

Plantarflexed

and often appears nearly:

Vertical.

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AP Radiograph

On the AP view, the talus is typically directed:

Medially.

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Navicular Position

The navicular is displaced:

Dorsally

and lies over the:

Neck of the talus.

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Ossification Limitation

The navicular usually does not ossify until approximately:

3–4 years of age.

Therefore, its position cannot be directly visualized in:

Young infants.

Instead, alignment is inferred from the:

First metatarsal axis.

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Forefoot Alignment

The forefoot is displaced:

Dorsally

and

Laterally or abducted

relative to the hindfoot.

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Calcaneus

The calcaneus remains in:

Equinus.

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Severe Deformity

In marked cases, the talus may become almost:

Parallel to the tibia.

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Stress Plantarflexion View

The most important confirmatory radiograph is the:

Forced plantarflexion lateral view.

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Technique

The examiner maximally plantarflexes the:

Forefoot

while obtaining a:

Lateral radiograph.

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True Vertical Talus

In true congenital vertical talus, the:

Talonavicular joint does not reduce

with plantarflexion.

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Talus–First Metatarsal Relationship

Even with maximal plantarflexion, the axis of the:

First metatarsal

remains dorsal to the:

Talus.

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Normal Relationship

In a flexible foot, the first metatarsal axis becomes approximately:

Collinear with the talar axis

during forced:

Plantarflexion.

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Position of the Navicular

Because the navicular is not ossified in an infant, its location is inferred from its relationship to the:

First ray.

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MRI

MRI is generally:

Not required to evaluate the foot deformity itself.

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Neurologic Evaluation

MRI may be appropriate when there is concern for a:

Spinal abnormality

or another:

Neurogenic cause.

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Pathological Anatomy

The:

Calcaneus

is in equinus and displaced relatively:

Laterally.