Orthopaedic Surgery - Pigmented Villonodular Synovitis

Basics

Pigmented villonodular synovitis (PVNS) is an uncommon proliferative disorder of the synovium characterized by villous or nodular synovial overgrowth with prominent:

Hemosiderin deposition

Lipid-laden macrophages

and

Multinucleated giant cells.

The modern terminology places PVNS within the spectrum of tenosynovial giant cell tumor (TGCT), with classic intra-articular PVNS generally corresponding to:

Diffuse-type TGCT.

Localized nodular lesions are commonly classified as:

Localized-type TGCT.

Typical Appearance

Grossly, the involved synovium develops:

Yellow-brown or reddish-brown villous projections

or

Nodular masses.

The characteristic brown discoloration results largely from:

Repeated hemorrhage and hemosiderin accumulation.

Common Sites

The most frequently affected joint is the:

Knee.

Other important sites include:

Hip

Ankle

Shoulder

and other synovial joints.

Disease is almost always:

Unilateral.

Synonyms

Historical terms include:

Pigmented villonodular synovitis

Hemorrhagic villous synovitis

The broader modern term is:

Tenosynovial giant cell tumor.

Classification

PVNS/TGCT may occur in two principal patterns.

Localized Type

Localized disease forms a:

Discrete synovial nodule or mass.

It is generally easier to remove completely and has a lower recurrence risk.

Diffuse Type

Diffuse disease involves a broad area of:

Synovium

and may extend throughout the joint or into adjacent:

Bursae

Tendon sheaths

Extra-articular soft tissues.

Diffuse disease is more difficult to eradicate completely and has a higher recurrence rate.

Epidemiology

PVNS is:

Uncommon.

It most often presents in:

Young to middle-aged adults.

There is no strong sex predominance, although some series have reported a slight:

Female predominance.

Risk Factors

No well-established risk factors have been identified.

Recurrent:

Hemarthrosis

has historically been proposed as a contributing factor, but a causal relationship has not been proven.

Genetics

PVNS is now understood to have a neoplastic basis in many cases rather than being purely inflammatory.

A subset of lesions demonstrates molecular abnormalities involving:

CSF1 overexpression or rearrangement, which recruits large numbers of macrophages into the lesion.

There is no recognized inherited Mendelian predisposition in most patients.

Etiology

The precise initiating event is not completely understood.

Older theories proposed:

Chronic inflammation

Repeated hemorrhage

or

Reactive synovial proliferation.

Current evidence supports PVNS/TGCT as primarily a:

Locally aggressive neoplastic synovial process.

Experimental Hemarthrosis

Animal studies have historically produced PVNS-like changes after repeated joint bleeding.

However, these lesions may regress when hemorrhage stops, unlike the persistent and progressive behavior typical of human diffuse TGCT.

Associated Conditions

There are no consistent systemic disorders associated with PVNS.

Diagnosis

Diagnosis is based on:

Clinical presentation

Imaging, particularly MRI

and, when necessary,

Histopathologic confirmation.

Signs and Symptoms

Symptoms usually develop:

Insidiously

and progress slowly.

Common Symptoms

Patients may report:

Joint pain

Swelling

Stiffness

Reduced range of motion

Recurrent atraumatic effusions

Recurrent Effusion

A characteristic presentation is:

Repeated nontraumatic joint swelling.

The effusion may recur without a clear injury.

Warmth

The affected joint may feel:

Mildly warm

because of chronic synovial proliferation and inflammation.

Palpable Mass

A synovial mass may occasionally be palpable.

At the knee, a lesion may sometimes be detected in the:

Suprapatellar pouch

or along the joint margins.

Physical Examination

A complete joint examination should be performed.

For the knee, evaluate:

Effusion

Warmth

Tenderness

Range of motion

Ligament stability

Meniscal signs

Muscle bulk

Range of Motion

Motion may be reduced because of:

Pain

Effusion

Mechanical obstruction

Progressive synovial thickening

Muscle Atrophy

Chronic symptoms may lead to:

Quadriceps or other periarticular muscle atrophy.

Hip, Shoulder, and Ankle Disease

When deeper joints are involved, examination may be relatively nonspecific.

Possible findings include:

Reduced range of motion

Muscle wasting

Joint pain

without an easily palpable mass.

Laboratory Tests

Routine blood tests are usually:

Normal and nonspecific.

They may be obtained when infection or inflammatory arthritis is being considered.

Joint Aspiration

Aspiration may produce:

Reddish-brown or blood-stained synovial fluid.

This reflects:

Repeated intra-articular hemorrhage and hemosiderin deposition.

Persistent unexplained hemorrhagic effusions should raise suspicion for PVNS/TGCT.

Imaging

Plain Radiographs

Radiographs may be normal early in the disease.

Early Radiographic Findings

Possible findings include:

Soft-tissue swelling

Subtle pressure erosions

Small juxta-articular erosions

These erosions may occur in:

Non-weight-bearing portions of the joint.

Late Radiographic Findings

Longstanding disease may produce:

Erosions on both sides of the joint

Subchondral bone loss

Degenerative changes

and eventually

Joint-space narrowing.

Joint-space loss is typically a relatively late feature.

MRI

MRI is the most useful imaging modality for:

Establishing the diagnosis

Defining disease extent

Planning surgery

Detecting recurrence.

MRI Findings

Characteristic findings include:

Joint effusion

Lobulated or irregular synovial thickening

Nodular synovial masses

Low-signal hemosiderin deposits

Hemosiderin Signal

Hemosiderin produces:

Low signal intensity on both T1- and T2-weighted sequences, particularly on gradient-echo or susceptibility-sensitive sequences.

This may create:

Blooming or signal dropout.

This finding is highly characteristic of PVNS/TGCT.

Extra-Articular Extension

MRI is also useful for identifying extension into:

Posterior compartments

Bursae

Tendon sheaths

Adjacent soft tissues

This is especially important before surgery for diffuse disease.

Pathological Findings

PVNS may appear grossly as:

Diffuse villous proliferation

or

Discrete nodular masses.

Gross Appearance

The synovium is often:

Brown

Yellow-brown

or

Reddish-brown

because of extensive hemosiderin deposition.

Microscopic Findings

Histology typically demonstrates:

Mononuclear synovial-like cells

Multinucleated giant cells

Foamy histiocytes

Hemosiderin-laden macrophages

Inflammatory cells

Differential Diagnosis

Important alternative diagnoses include:

Inflammatory arthritis

Traumatic hemarthrosis

Septic arthritis

Synovial sarcoma

Hemophilic or other hemosiderotic arthropathy

Hemochromatosis

Synovial chondromatosis

Inflammatory Arthritis

Inflammatory arthropathies may cause:

Synovial thickening

Effusion

Pain

but typically lack the characteristic hemosiderin-rich MRI pattern of PVNS.

Infection

Septic arthritis should be considered when there is:

Acute pain

Fever

Marked warmth

Elevated inflammatory markers

Purulent aspirate

PVNS generally follows a more chronic course.

Synovial Sarcoma

Synovial sarcoma is an important malignant soft-tissue differential diagnosis, particularly when imaging shows:

An atypical extra-articular mass

Aggressive bone destruction

or unusual clinical features.

Hemosiderotic Arthropathy

Repeated hemarthrosis, such as in:

Hemophilia, can also produce hemosiderin deposition.

Clinical history and imaging distribution help distinguish it from PVNS/TGCT.

Treatment

General Principles

PVNS/TGCT is generally:

Benign but locally aggressive.

The principal goals are to:

Relieve symptoms

Remove abnormal synovium

Prevent recurrence

Preserve articular cartilage and joint function

Malignant Transformation

True malignant transformation is:

Extremely rare.

Most cases remain histologically benign despite potentially aggressive local behavior.

Symptomatic Treatment

Temporary symptom control may include:

Activity modification

Splinting or immobilization when necessary

NSAIDs

Analgesics

These measures do not eradicate the underlying proliferative synovial lesion.

Localized Disease

Localized nodular TGCT usually responds well to:

Complete excision

which can be performed:

Arthroscopically

or

Open, depending on location.

Diffuse Disease

Diffuse PVNS/TGCT usually requires:

Synovectomy.

Because disease may infiltrate multiple synovial recesses, complete removal can be difficult.

This contributes to a:

Higher recurrence rate.

Arthroscopic Synovectomy

Arthroscopic synovectomy through multiple portals is frequently used for:

Intra-articular diffuse disease, especially in the knee.

Advantages include:

Reduced soft-tissue trauma

Improved visualization of many compartments

Earlier postoperative rehabilitation

Open Synovectomy

Open surgery may be necessary when disease demonstrates:

Extensive posterior involvement

Extra-articular extension

Poor arthroscopic accessibility

At the knee, a posterior approach may be required for lesions involving the:

Posterior capsule or extra-articular tissues.

Combined Approaches

Some extensive diffuse lesions are treated with:

Combined arthroscopic and open synovectomy

or

Anterior and posterior open procedures

to improve disease clearance.

Radiotherapy

Radiotherapy may be considered in:

Recurrent

Residual

or

Diffuse disease that cannot be completely excised.

External-Beam Radiotherapy

External-beam radiation has historically been used for:

Difficult recurrent PVNS

or cases in which complete synovectomy would cause unacceptable morbidity.

Its use is individualized because of potential long-term radiation effects.

Radiosynovectomy

Intra-articular administration of radioactive isotopes has also been described as:

Radiation synovectomy.

It is used much less commonly and depends on regional practice and specialist expertise.

Systemic Targeted Therapy

For unresectable, recurrent, or highly morbid diffuse-type TGCT, modern treatment may include systemic agents targeting the:

CSF1/CSF1-receptor pathway.

These treatments are generally managed through:

Specialist musculoskeletal oncology teams.

Medication

NSAIDs and other analgesics may be used for:

Symptom control.

They do not alter the underlying disease.

Follow-Up

Because recurrence can occur after treatment, patients require clinical surveillance.

Follow-up may include:

Physical examination

and

MRI when recurrence is suspected or when diffuse disease has been treated.

Historical Surveillance

Older protocols commonly recommended MRI approximately every:

6–12 months

after treatment, particularly for diffuse disease.

Modern surveillance intervals are individualized according to:

Disease extent

Completeness of resection

Symptoms

Recurrence risk.

Prognosis

The overall prognosis is generally:

Good, particularly for localized disease.

The main concern is:

Local recurrence, especially after treatment of diffuse PVNS.

Localized Disease Prognosis

Complete excision usually provides:

Excellent symptom relief

with a relatively low recurrence risk.

Diffuse Disease Prognosis

Diffuse disease has a less predictable course because:

Complete synovectomy may be difficult

and recurrence is more common.

Repeated procedures may occasionally be necessary.

Complications

Recurrence

The most common complication is:

Local recurrence.

This is particularly important in:

Diffuse-type disease.

Articular Damage

Longstanding proliferative synovium may cause:

Cartilage destruction

Subchondral erosion

Bone loss

Secondary Arthritis

Chronic articular damage may ultimately result in:

Secondary osteoarthritis.

Joint Replacement

Severe end-stage joint destruction may eventually require:

Total joint arthroplasty, particularly in the hip or knee.

Surgical Complications

Treatment may also lead to:

Joint stiffness

Neurovascular injury

Infection

Postoperative fibrosis

depending on the extent and location of surgery.

Patient Monitoring

Follow-up should assess for:

Recurrent pain

Swelling

Effusion

Loss of motion

Palpable recurrent mass

MRI is especially useful for detecting:

Early local recurrence.

Asymptomatic Recurrence

Small asymptomatic recurrent lesions may occasionally be:

Observed, particularly when further treatment would produce greater morbidity than the disease itself.

Management should be individualized according to:

Symptoms

Growth

Joint damage

Disease location.

Key Principle

Pigmented villonodular synovitis, now generally classified within tenosynovial giant cell tumor, is a benign but locally aggressive proliferative synovial disorder characterized by hemosiderin deposition and recurrent atraumatic joint swelling.

MRI typically demonstrates:

Hemosiderin-related low signal with blooming or signal dropout.

Localized disease is usually treated successfully with:

Complete excision, whereas diffuse disease often requires:

Extensive synovectomy and careful long-term surveillance because recurrence is common.

Orthopaedic Surgery - Phalanx Fracture

Basics

Phalangeal fractures are fractures involving the bones of the fingers.

They are classified according to:

Which phalanx is involved — proximal, middle, or distal

Location within the phalanx

Fracture pattern

Degree of complexity or comminution

Open versus closed injury

Stability during motion

Accurate assessment of alignment and associated soft-tissue injury is important because even a well-healed fracture can produce substantial functional impairment if there is:

Rotation

Angular deformity

Joint incongruity

or

Tendon adhesion.

Epidemiology

Phalangeal fractures occur commonly in:

Males in the third through fifth decades of life

and are frequently associated with:

Sports

Occupational injuries

Machinery

Reported incidence has been approximately:

12.5 per 10,000 person-years.

Sports-Related Injuries

In some series of sports-related hand fractures, approximately:

54% involved the phalanges.

Common sports include:

Basketball

Baseball

Football

and other activities involving:

Ball contact

Falls

Direct trauma to the fingers

Pediatric Considerations

Hand fractures are also common in children.

Approximately:

43% of pediatric hand fractures

have been reported to involve the:

Proximal phalanx.

Children have substantial remodeling potential, but certain injuries, particularly:

Phalangeal neck fractures

and

Physeal injuries

require careful assessment because of the risk of deformity or vascular compromise.

Risk Factors

Risk increases with participation in activities involving:

Power tools

Industrial machinery

Manual labor

Contact sports

Ball-handling sports

In children, common mechanisms include:

Skating

Rollerblading

Scooter riding

and falls during recreational activities.

Etiology

The typical mechanism varies with age and activity.

Children

Children older than approximately 10 years frequently sustain fractures from:

Compression or impact injuries.

Adolescents and Young Adults

Between approximately ages:

10 and 39 years

injuries are commonly associated with:

Sports

Contact activities

Ball-handling injuries

Adults

Adults between approximately:

30 and 69 years

commonly sustain fractures from:

Machinery or occupational trauma.

Older Adults

In patients aged approximately:

60 years or older

falls become an increasingly important mechanism.

Other Mechanisms

Additional causes include:

Crush injuries

Motor vehicle collisions

Direct blows

Twisting injuries

Distal Phalanx Fractures

The most common mechanism for a distal phalanx fracture is:

Crush injury.

This frequently occurs after:

Door injuries

Heavy-object impact

or occupational trauma.

Fracture Pattern and Mechanism

A:

Direct blow

commonly produces:

Transverse

or

Comminuted fractures.

A:

Twisting mechanism

more commonly produces:

Oblique

or

Spiral fractures.

Associated Conditions

Patients may also have:

Additional fractures of the hand

Metacarpal fractures

Wrist or forearm injury

Tendon injury

Ligament injury

Neurovascular injury

Diagnosis

Signs and Symptoms

Typical findings include:

Pain

Swelling

Bruising

Finger deformity

Reduced range of motion

Some patients have:

Lacerations

suggesting a possible open fracture.

Numbness

Numbness or altered sensation may occur, particularly when there is:

Significant displacement

Severe swelling

or

Associated digital nerve injury.

History

Important historical details include:

Mechanism of injury

Time elapsed since injury

Patient age

Hand dominance

Occupation

Sports participation

Hobbies

These factors help determine both injury pattern and functional treatment goals.

Physical Examination

Neurovascular Examination

Document:

Capillary refill

Digital sensation

Motor function

Perfusion

before and after reduction.

Tenderness

Palpate the finger carefully to determine:

The exact fracture location

and whether tenderness extends into an adjacent joint.

Open Injury

Inspect the entire digit for:

Lacerations

Puncture wounds

Nail-bed injury

Any wound communicating with the fracture should be treated as an:

Open fracture.

Soft-Tissue Examination

Assess for injury to:

Flexor tendons

Extensor tendons

Collateral ligaments

Digital nerves

Digital vessels

Soft-tissue injury may have greater long-term functional impact than the fracture itself.

Length and Alignment

Compare the injured digit with neighboring fingers.

Assess:

Finger length

Coronal alignment

Sagittal alignment

Rotation

Rotational Deformity

Rotation is particularly important because even small rotational errors can cause substantial functional problems.

Ask the patient to make a:

Composite fist.

Normally, the fingers converge toward the:

Scaphoid region.

If one finger crosses over or under an adjacent finger, this:

Scissoring

indicates rotational deformity.

Rotational deformity is generally:

Poorly tolerated and should be corrected.

Nail Plate Examination

Inspect and compare the nail plate with the adjacent digits.

Look for:

Subungual hematoma

Nail displacement

Nail-bed laceration

Seymour fracture in children

Imaging

Plain Radiographs

Initial imaging should include:

AP

Lateral

and usually

Oblique views.

Whenever possible, radiographs should be centered specifically on the injured finger rather than relying only on a general hand film.

Oblique Views

Oblique radiographs are useful for identifying:

Intra-articular extension

Condylar fractures

Oblique fracture lines

CT

CT is not routinely required for simple fractures.

It may be helpful for:

Complex intra-articular fractures

Comminution

Surgical planning

For suspected radiolucent foreign bodies such as:

Wood or thorns, CT may occasionally assist, although ultrasound can also be useful depending on the material and location.

MRI

MRI can identify:

Soft-tissue injuries

and many types of:

Foreign bodies

but is rarely required for routine phalangeal fracture assessment.

Pathophysiology

The direction of fracture displacement depends heavily on:

Muscle and tendon attachments.

Proximal Phalanx Shaft Fractures

Proximal phalanx shaft fractures often angulate:

Volar or palmar at the apex.

The proximal fragment is typically pulled into:

Flexion by the interosseous muscles

while the distal fragment is influenced by the extensor mechanism.

This can produce a characteristic deformity if reduction is not maintained.

Middle Phalanx Shaft Fractures

Middle phalanx fracture angulation depends on the fracture’s relationship to the:

Flexor digitorum superficialis insertion.

Fractures may therefore angulate:

Volar

or

Dorsal

depending on their location.

Importance of Soft-Tissue Injury

Finger function depends not only on fracture union but also on preservation of:

Tendon gliding

Ligament stability

Neurovascular integrity

Joint motion

This explains why even relatively small fractures can cause prolonged disability when accompanied by severe soft-tissue injury.

Pediatric Phalangeal Neck Fractures

Phalangeal neck fractures in children deserve particular attention because the distal fragment may have a relatively limited blood supply.

These injuries can therefore be associated with:

Avascular necrosis

Malunion

Motion loss

Differential Diagnosis

An important alternative diagnosis is:

Pathological fracture through an underlying bone lesion.

In the hand, the most common benign tumor associated with pathological fracture is:

Enchondroma.

Treatment

General Principles

Most phalangeal fractures can be treated:

Nonoperatively

provided they are:

Stable

Extra-articular

Acceptably aligned

and have:

No rotational deformity.

Treatment usually consists of:

Closed reduction when needed

Splinting or buddy taping

Early protected motion

Operative Indications

Surgery is considered for:

Open fractures

Displaced intra-articular fractures

Fractures with severe soft-tissue injury

Unstable fractures after closed reduction

Rotational deformity

Unacceptable angulation or shortening

Angulation

Marked palmar angulation may cause:

Functional impairment

Extensor lag

Cosmetic deformity

Older criteria considered more than approximately:

25° of palmar angulation

unacceptable in many situations, although acceptable deformity depends on:

Which phalanx is fractured

Which finger is involved

Fracture level

Buddy Taping

Stable nondisplaced or impacted fractures may be treated with:

Buddy taping

in which the injured finger is taped to an adjacent finger that acts as a functional splint.

This is appropriate only when the fracture is:

Truly stable

with:

Minimal angulation

and

No rotation.

Closed Reduction

When reduction is required, a:

Digital nerve block

may be used.

The distal fragment is manipulated to restore:

Length

Rotation

Angular alignment

The reduction must remain stable enough to be maintained with:

Splinting or buddy taping.

Intrinsic-Plus Position

When immobilization of the hand is required, it is generally placed in the:

Intrinsic-plus or safe position.

This typically involves:

MCP joints flexed approximately 70–90°

and

Interphalangeal joints near full extension.

This position helps minimize:

Collateral ligament contracture

and later stiffness.

Immobilization

Stable closed fractures are often protected for approximately:

3–4 weeks.

Children may occasionally require approximately:

4 weeks or slightly longer

depending on fracture pattern and healing.

Adults tend to develop joint stiffness more readily than children.

Importance of Early Motion

Prolonged immobilization is one of the major causes of poor finger outcomes.

When stability permits, motion should begin:

As early as safely possible.

Delaying active motion beyond approximately:

3 weeks

substantially increases the risk of persistent stiffness in many adult injuries.

Physical Therapy

Hand therapy is important when stiffness, swelling, or complex injury is present.

Early Motion

Joints not included in the splint should begin:

Active range-of-motion exercises immediately.

The fractured finger can begin protected motion once sufficient stability is present.

Clinical Healing

Soft-tissue mobilization and more active motion can usually advance when:

Fracture-site tenderness is minimal

and

Gentle manipulation is no longer painful.

This commonly occurs around:

3–4 weeks in uncomplicated fractures.

Postoperative Motion

After surgical fixation, range-of-motion exercises are often started at approximately:

2–4 weeks or earlier

when fixation stability allows.

The purpose of stable fixation is frequently to permit:

Earlier rehabilitation.

Medication

Most patients can be managed with:

Acetaminophen

or

NSAIDs, when appropriate.

Stronger analgesia is rarely required except after:

Severe crush injuries

Open fractures

or

Surgery.

Surgery

Surgical Indications

Operative treatment is appropriate when closed treatment cannot maintain:

Rotation

Length

Angular alignment

or when joint congruity cannot be restored.

Intra-Articular Fractures

Displaced intra-articular fractures require accurate restoration of:

The joint surface

because residual step-off or instability may lead to:

Stiffness

Post-traumatic arthritis

Severe Soft-Tissue Injury

Unstable fractures associated with major tendon or soft-tissue injury may require fixation so that:

Early soft-tissue rehabilitation can proceed safely.

Rotational Deformity

Persistent rotational malalignment is a strong indication for:

Operative correction, because remodeling does not reliably correct clinically significant rotation.

Distal Tuft Fractures

Distal tuft fractures are usually associated with:

Crush injuries.

Treatment often focuses on:

Nail-bed repair

Protection of the fingertip

Management of associated open injury.

The nail plate itself may act as a:

Natural splint.

Pin fixation is occasionally needed when the fracture is:

Markedly displaced or unstable.

Mallet Fracture

Bony mallet injuries involving the dorsal distal phalanx can often be treated with:

Continuous DIP extension splinting, traditionally for approximately 6 weeks or longer.

Surgical indications depend on:

Fragment size

Joint subluxation

Failure of splint treatment

and remain somewhat controversial.

Shaft Fracture Fixation

Options include:

Kirschner wires

Lag screws

Mini-plates

Intramedullary devices

The choice depends on:

Fracture configuration

Soft-tissue condition

Need for early motion.

Plate and Screw Fixation

Open fixation can provide:

Direct visualization

More precise reduction

Stable fixation

This may permit early rehabilitation but can also increase the risk of:

Tendon adhesion

because of additional soft-tissue dissection.

Volar Lip and PIP Fracture-Dislocations

Intra-articular volar fractures involving the base of the middle phalanx may be treated with:

Pinning

Plate fixation

Volar plate arthroplasty

or

Hemihamate reconstruction

depending on:

Fragment size

Joint stability

Percentage of articular surface involved.

Large defects involving approximately:

40% or more of the joint surface

are particularly prone to instability.

Dynamic External Fixation

Dynamic external fixation may be used for:

Severely comminuted

or

Impacted intra-articular fractures

when standard internal fixation would not adequately restore stability.

It allows:

Joint distraction

while maintaining some controlled motion.

Condylar Fractures

Intra-articular condylar fractures may require:

Pin fixation

or

Headless compression screws.

Precise restoration of the:

Articular surface

is essential.

Tension-Band Techniques

Tension-band fixation can supplement stabilization of:

Small or relatively unstable fragments

in selected fracture patterns.

Segmental Bone Loss

Segmental defects require restoration of:

Digital length and alignment.

Treatment may include:

Open reduction

Internal fixation

Bone grafting.

Pediatric Seymour Fracture

A Seymour fracture is an open physeal fracture of the distal phalanx associated with:

Nail-bed injury.

It should be treated as an:

Open fracture

with:

Irrigation

Debridement

Nail-bed repair

Appropriate antibiotics

and stabilization when necessary.

Failure to recognize the injury can lead to:

Infection

Osteomyelitis

Growth disturbance

Salvage Arthroplasty

For irreparable interphalangeal joint destruction, salvage procedures may include:

Silicone arthroplasty

or other joint replacement options.

These may be considered after acute injury or later for:

Post-traumatic joint destruction.

Arthrodesis

Fusion may be preferable to arthroplasty when the primary goals are:

Pain relief

Stability

Durable alignment

particularly when motion cannot be restored reliably.

Follow-Up

Post-reduction radiographs should be obtained:

Immediately

to confirm alignment.

Early Repeat Imaging

Radiographs are often repeated within:

3–7 days

to ensure the fracture has not:

Redisplaced.

This is especially important for fractures considered:

Borderline stable.

Subsequent Imaging

Further radiographs may be obtained approximately every:

4 weeks

until adequate healing is demonstrated.

The schedule should be individualized according to:

Fracture type

Stability

Treatment method

Prognosis

Most uncomplicated phalangeal fractures heal well.

A poorer prognosis is associated with:

Age over approximately 50 years

Associated tendon injury

Joint involvement

Multiple fractures in the same digit

Crush injury

Skin loss

Open injury

Complications

Malunion

Malunion may produce:

Rotational deformity

Lateral deviation

Volar angulation

Articular incongruity

Rotational Malunion

Clinically significant malrotation may require:

Corrective rotational osteotomy.

Angular Malunion

Angular deformity may be treated with:

Closing-wedge osteotomy

or another corrective procedure depending on the direction of deformity.

Intra-Articular Malunion

A poorly aligned joint surface may occasionally require:

Corrective intra-articular osteotomy

in selected patients.

Tendon Adhesions

Tendon adherence is particularly common after:

Crush injuries

Open fractures

Plate fixation

It can markedly limit:

Finger flexion or extension.

Hand Therapy for Adhesions

Intensive hand rehabilitation is the first-line treatment.

Surgical:

Tenolysis

should generally be considered only after:

Passive joint motion has been maximized

and the fracture and soft tissues have fully healed.

Nonunion

Nonunion is uncommon.

It occurs more often in:

Open fractures

than in closed fractures.

Potential causes include:

Severe soft-tissue injury

Infection

Soft-tissue interposition

Poor vascularity

Infection

Infection risk is increased in:

Open fractures

Seymour fractures

Crush injuries

Contaminated wounds

Stiffness

Stiffness is one of the most common and important complications.

Risk increases with:

Immobilization beyond approximately 3 weeks

Joint involvement

Crush injury

Open fracture

Extensive surgical dissection

Patient Monitoring

Follow-up should continue until:

Clinical fracture healing is established

and

Finger function is acceptable.

Monitoring should include:

Pain

Tenderness

Alignment

Rotation

Range of motion

Tendon function

Radiographic healing

Key Principle

Phalangeal fractures should be treated with the dual goals of restoring alignment and preserving finger motion.

The most important deformity to recognize is:

Rotation, because even a small amount can produce substantial scissoring and functional impairment.

Most stable extra-articular fractures can be managed with:

Buddy taping or splinting followed by early protected motion, whereas unstable, open, intra-articular, or rotationally displaced fractures often require:

Operative fixation and structured hand rehabilitation.

Orthopaedic Surgery - Phalanx Dislocation

Basics

Phalangeal dislocations involve disruption of the normal articulation of one of the joints of the hand.

They may involve the:

Metacarpophalangeal (MCP) joint

Proximal interphalangeal (PIP) joint

Distal interphalangeal (DIP) joint

Dislocations may occur alone or together with:

Fracture

Collateral ligament injury

Volar plate injury

Tendon disruption

Capsular injury

Classification is based primarily on:

The joint involved

and

The direction of displacement.

PIP Joint Dislocations

The PIP joint is the most commonly dislocated finger joint.

Dorsal PIP Dislocation

This is the:

Most common PIP dislocation.

It usually results from:

Hyperextension

with injury to the:

Volar plate.

The middle phalanx is displaced dorsally relative to the proximal phalanx.

Volar PIP Dislocation

Volar PIP dislocation is uncommon.

It usually results from:

Hyperflexion or rotational trauma

and is important because it may be associated with disruption of the:

Central slip of the extensor mechanism.

Failure to recognize central slip injury can later result in:

Boutonnière deformity.

Rotatory PIP Dislocation

Rotatory dislocations are rare.

They may occur when one condyle of the proximal phalanx:

Buttonholes between the central slip and lateral band of the extensor mechanism.

These injuries may be difficult to reduce by closed manipulation.

MCP Joint Dislocations

MCP dislocations may be:

Dorsal

Volar

or

Lateral.

Lateral MCP Dislocation

Lateral displacement is usually associated with:

Collateral ligament injury.

Dorsal MCP Dislocation

Dorsal MCP dislocation is associated with disruption of the:

Volar plate.

Some dorsal MCP dislocations are:

Complex and irreducible by closed means

because the volar plate or other soft tissue becomes interposed within the joint.

DIP Joint Dislocations

DIP dislocations are less common than PIP dislocations.

They are usually caused by:

Hyperextension trauma.

Simple DIP Dislocation

A simple dislocation can generally be:

Reduced with closed manipulation.

Complex DIP Dislocation

A complex dislocation cannot be reduced by closed means because of:

Soft-tissue or fracture-fragment interposition.

Entrapped structures may include the:

Volar plate

Flexor tendon

or other periarticular tissue.

Thumb MCP Injuries

Thumb MCP dislocation should be distinguished from:

Skier’s thumb or gamekeeper’s thumb, which refers specifically to an injury of the ulnar collateral ligament of the thumb MCP joint.

Dislocation may coexist with collateral ligament injury.

Prevention

Hand injuries in sports may be reduced by:

Appropriate coaching

Protective technique

Recognition of injury mechanisms

Prompt treatment after injury

In children’s sports, modifications such as softer equipment and appropriate size or weight categories may reduce injury risk in selected activities.

Epidemiology

Joint dislocations of the fingers occur most commonly in:

Skeletally mature adolescents and adults.

Pediatric Considerations

In younger children, the:

Growth plate is often weaker than the capsule and ligaments.

Therefore, a similar traumatic force may produce:

Physeal fracture or separation

rather than a true joint dislocation.

Incidence

PIP joint dislocations are relatively common in sports.

One study of NFL upper-extremity injuries reported that approximately:

17% involved PIP dislocations.

DIP dislocations are less common.

The most frequent pattern is:

Dorsal PIP dislocation.

Risk Factors

Activities associated with increased risk include:

Basketball

Football

Skiing

Ball sports

and other activities involving direct impact to an extended finger.

Genetics

There is no known Mendelian inheritance pattern associated with traumatic phalangeal dislocation.

Etiology

Trauma is the principal cause.

Dorsal Dislocation

Usually caused by:

Hyperextension.

This mechanism commonly disrupts the:

Volar plate.

Volar Dislocation

Usually caused by:

Hyperflexion

or rotational trauma.

Volar PIP injuries may damage the:

Central slip.

Rheumatoid Arthritis

Chronic inflammatory disease may also predispose to joint instability.

In rheumatoid arthritis, progressive damage can produce:

Volar plate insufficiency

PIP hyperextension

Swan-neck deformity

MCP volar subluxation

These are chronic deformities rather than typical acute traumatic dislocations.

Associated Conditions

Phalangeal dislocation may occur with:

Phalangeal fracture

Volar plate avulsion

Collateral ligament tear

Central slip injury

Flexor or extensor tendon injury

Small Avulsion Fragments

Small fracture fragments on radiographs are clinically important because they may represent:

Avulsion of a ligament, tendon, or volar plate attachment.

They should not be dismissed as incidental.

Diagnosis

Signs and Symptoms

Typical findings include:

Pain

Visible deformity

Swelling

Ecchymosis

Loss of motion

Neurovascular Symptoms

Marked displacement may compress digital neurovascular structures and cause:

Numbness

Paresthesia

Reduced perfusion

Although uncommon, these findings require urgent reduction.

History

Important details include:

Mechanism of injury

Direction of force

Time since injury

Any attempted reduction

Previous injuries to the digit

Hand dominance

Physical Examination

Neurovascular Status

Document before and after reduction:

Capillary refill

Digital sensation

Motor function when possible.

Skin Examination

Inspect carefully for:

Open wounds

Skin tenting

Lacerations

A small wound near a dislocated joint may indicate:

An open dislocation.

Deformity

The direction of displacement is often obvious on inspection.

The finger should be compared with the:

Contralateral side

when necessary.

Post-Reduction Examination

After reduction and once severe swelling subsides, reassess:

Joint stability

Collateral ligament integrity

Volar plate function

Tendon function

Range of motion

Central Slip Examination

After a volar PIP dislocation, evaluate specifically for:

Central slip injury

because missed disruption can progress to a:

Boutonnière deformity.

Imaging

Plain Radiographs

Initial radiographs should include:

AP

True lateral

Oblique views

These are necessary to evaluate:

Joint alignment

Fracture fragments

Articular involvement

Post-Reduction Radiographs

Radiographs should generally be repeated after reduction to confirm:

Concentric joint alignment

and identify:

Associated fractures that may not have been obvious initially.

Stress Views

Stress radiographs may occasionally help evaluate:

Collateral ligament insufficiency

after the joint has been reduced.

They are not routinely required for every injury.

Differential Diagnosis

Important alternatives and associated conditions include:

Fracture-dislocation

Chronic unreduced dislocation

Collateral ligament injury

Volar plate injury

Central slip injury

Rheumatoid deformity

Septic arthritis

Treatment

General Principles

The goals are to:

Restore joint congruity

Protect injured soft tissues

Minimize swelling

Begin motion early enough to avoid stiffness

Closed Reduction

Most simple dislocations can be treated with:

Closed reduction.

Reduction Technique

Reduction should be:

Gentle and controlled.

The joint is first:

Disimpacted with longitudinal traction

followed by controlled movement that reverses the mechanism of injury.

Forceful manipulation should be avoided because it can:

Entrap soft tissue

Create fracture

or

Worsen ligament or tendon damage.

Dorsal PIP Reduction

A typical dorsal PIP dislocation is reduced by:

Gentle traction

followed by:

Flexion of the middle phalanx over the proximal phalangeal head.

After Reduction

Once reduction is achieved:

Confirm stability

Repeat neurovascular examination

Obtain post-reduction radiographs

Control swelling

RICE Measures

Initial swelling control may include:

Rest

Ice

Compression

Elevation

Pediatric Patients

Children may require a somewhat longer period of initial protection because of:

Soft-tissue and physeal considerations.

Older protocols suggested immobilization for approximately:

7–10 days

after a stable reduction.

Prolonged immobilization should still be avoided when possible because finger joints stiffen quickly.

PIP Joint Treatment

Most stable dorsal PIP dislocations can begin:

Early range of motion

with or without:

Buddy taping.

Buddy Taping

Buddy taping is particularly useful for:

Stable collateral ligament injuries

and allows protected early motion.

Volar Plate Injury

A stable volar plate injury may be treated with an:

Extension-block splint

that prevents excessive extension while allowing controlled flexion.

Collateral Ligament Injury

Stable collateral ligament injuries are generally treated with:

Buddy taping

and early protected motion.

Complete Soft-Tissue Rupture

More substantial injuries involving complete disruption of:

Collateral ligaments

Volar plate

or

Central slip

may require a longer period of splinting, often:

Several weeks

depending on the structure involved and joint stability.

MCP Joint Immobilization

After reduction of a stable MCP dislocation, the joint is often protected in approximately:

50–70° of flexion.

The exact position depends on:

The joint

Direction of injury

Stability after reduction.

Central Slip Injury

Central slip injury requires specific protection.

The PIP joint is generally maintained in:

Full extension

while DIP motion is encouraged.

Older protocols often used approximately:

3 weeks of rigid extension splinting followed by dynamic splinting, although modern treatment commonly requires a longer continuous extension period depending on injury severity.

Physical Therapy

Hand therapy is important once joint stability is confirmed.

Treatment may include:

Active range-of-motion exercises

Gentle passive motion when safe

Edema control

Tendon-gliding exercises

Splint management

Importance of Early Motion

Finger joints, especially the PIP joint, develop stiffness rapidly.

Therefore, when the reduction is stable:

Early protected motion is preferred over prolonged immobilization.

Medication

Pain may be treated with:

Acetaminophen

or

NSAIDs

when appropriate.

Surgery

Surgery is indicated when:

Closed reduction fails

or when associated injuries require operative treatment.

Causes of Irreducibility

Closed reduction may fail because of:

Entrapped volar plate

Tendon interposition

Fracture fragment blocking reduction

Buttonholing of the phalanx through soft tissue

Operative Reduction

Both:

Volar

and

Dorsal approaches

may be used depending on the:

Joint involved

Direction of dislocation

Entrapped structure.

The joint is cleared and restored to:

Concentric alignment.

Associated Fracture Fixation

Surgery may also be necessary to stabilize:

Large articular fracture fragments

or

Unstable fracture-dislocations.

Open Injuries

Open dislocations require:

Irrigation

Debridement

Reduction

and treatment of associated:

Tendon, ligament, or fracture injury.

Thumb Ulnar Collateral Ligament Injury

A displaced complete thumb UCL tear may develop a:

Stener lesion, in which the torn ligament becomes trapped superficial to the adductor aponeurosis.

A Stener lesion generally requires:

Operative repair.

Referral

Early referral to a hand surgeon is appropriate for:

Irreducible dislocations

Open dislocations

Fracture-dislocations

Unstable injuries

Thumb MCP injuries with suspected complete UCL tear

Neurovascular compromise

Follow-Up

Patients should be reassessed to ensure:

Joint stability

Maintenance of reduction

Improvement in swelling

Preservation of motion

Prognosis

Most simple dislocations have a:

Good functional outcome

when reduced promptly and mobilized appropriately.

However, some degree of:

Residual swelling or loss of motion

is common, particularly at the:

PIP joint.

Persistent Swelling

PIP joint swelling may persist for:

Many months, occasionally up to a year after injury.

This does not necessarily indicate treatment failure.

Complications

Stiffness

The most common problem is:

Loss of motion, particularly after prolonged immobilization.

Recurrent Instability

Failure of ligament or volar plate healing may result in:

Chronic instability

or

Recurrent dislocation.

Chronic Deformity

Missed injuries can result in:

Swan-neck deformity

Boutonnière deformity

Flexion contracture

Neurovascular Injury

Digital nerve or vascular injury is uncommon but may occur in:

Severely displaced or open injuries.

Post-Traumatic Arthritis

Articular fracture or residual joint incongruity may eventually cause:

Post-traumatic osteoarthritis.

Patient Monitoring

Follow-up is usually performed every:

Several weeks during the early recovery period

to assess:

Range of motion

Stability

Pain

Swelling

Tendon function

Hand therapy may continue until adequate:

Motion and functional use

have returned.

Key Principle

Phalanx dislocations most commonly involve the PIP joint, with dorsal dislocation from hyperextension being the classic injury.

Management emphasizes:

Prompt closed reduction, careful assessment for associated fracture or tendon injury, and early protected motion once the joint is stable.

Irreducible, open, unstable, or fracture-associated dislocations require:

Early hand-surgical evaluation and, when necessary, operative reduction and repair.

Orthopaedic Surgery - Phalangeal Joint Arthritis

Basics

Phalangeal joint arthritis is a degenerative process affecting the articular cartilage and adjacent subchondral bone of the hand joints.

Progressive degeneration may lead to:

Cartilage loss

Joint-space narrowing

Subchondral bone change

Osteophyte formation

Joint deformity

Loss of motion

The joints most commonly affected are:

Distal interphalangeal (DIP) joints

Proximal interphalangeal (PIP) joints

and

Thumb carpometacarpal (CMC) joint.

The metacarpophalangeal (MCP) joints are much less commonly affected by primary osteoarthritis.

Classification

Hand arthritis can be classified as:

Primary

or

Secondary.

Primary Arthritis

Primary osteoarthritis occurs without an identifiable pre-existing joint disorder.

It is associated with:

Aging

Genetic susceptibility

Cumulative mechanical loading

Secondary Arthritis

Secondary arthritis develops after another process has damaged the joint.

Potential causes include:

Trauma

Previous infection

Inflammatory rheumatologic disease

Hemophilia

Hereditary hemochromatosis

Gout

Calcium pyrophosphate deposition disease (CPPD)

Epidemiology

Radiographic degenerative changes of the hand are extremely common with advancing age.

Older studies estimated radiographic hand osteoarthritis in as many as:

Approximately 75% of adults in selected older populations.

However, most radiographic disease is:

Asymptomatic.

Clinically significant symptoms occur in a much smaller proportion, historically:

Less than approximately 20%.

Risk Factors

Important risk factors include:

Increasing age

Previous trauma

Prior joint infection

Hemophilia

Hemochromatosis

Crystal deposition disease

Repetitive mechanical loading

Genetics

Osteoarthritis has an important hereditary component.

Rather than being caused by one gene in most patients, susceptibility is generally:

Polygenic and multifactorial.

Genetic variants affecting cartilage matrix, bone metabolism, and joint development may influence the risk of developing hand osteoarthritis.

Etiology

Degenerative arthritis may result from a combination of:

Mechanical cartilage injury

Biochemical alteration of cartilage

Genetic predisposition

Crystal deposition

Previous inflammation or trauma

Associated Conditions

Patients with hand osteoarthritis may also have degenerative arthritis involving other joints, particularly the:

Hip

and

Knee.

Diagnosis

Diagnosis is based on:

History

Physical examination

and

Plain radiographs.

Laboratory testing is reserved mainly for patients in whom an inflammatory, infectious, or metabolic cause is suspected.

Signs and Symptoms

Common symptoms include:

Joint pain

Morning stiffness

Reduced motion

Progressive enlargement or deformity of the finger joints

Pain

Pain may begin without a clear traumatic event.

It can be:

Intermittent initially

and become progressively more persistent as degeneration advances.

Pain is commonly aggravated by:

Gripping

Pinching

Repetitive hand use

Morning Stiffness

Patients frequently report:

Morning stiffness

or stiffness after inactivity.

In primary osteoarthritis, this is generally shorter in duration than the prolonged stiffness associated with many inflammatory arthropathies.

Joint Deformity

Progressive osteophyte formation and bony hypertrophy can produce visible enlargement of:

DIP joints

and

PIP joints.

DIP Joint Disease

Bony enlargement of the DIP joints is classically referred to as:

Heberden nodes.

PIP Joint Disease

Bony enlargement involving the PIP joints is classically referred to as:

Bouchard nodes.

MCP Joint Involvement

Primary degenerative arthritis only rarely affects the MCP joints.

Prominent MCP arthritis should prompt consideration of secondary causes such as:

Rheumatoid arthritis

Hemochromatosis

CPPD

Previous trauma

Loss of Motion

Range of motion may decrease because of:

Joint incongruity

Osteophyte impingement

Tophaceous deposits

Pain

Soft-tissue contracture

End-Stage Stiffness

Progressive periarticular fibrosis may eventually produce:

Severe stiffness

or

Ankylosis.

Physical Examination

Inspection

Look for:

Swelling

Bony enlargement

Angular deformity

Joint deviation

Skin changes

Range of Motion

Interphalangeal joints may demonstrate:

Reduced flexion

Reduced extension

Fixed contracture

or

Ankylosis.

Palpation

The affected joint may demonstrate:

Tenderness

Bony prominence

Crepitus

Soft-tissue swelling

Thumb Examination

When the thumb CMC joint is symptomatic, evaluate:

Pain with pinch

Base-of-thumb tenderness

CMC instability or crepitus

Laboratory Tests

Routine laboratory studies are not required for straightforward degenerative osteoarthritis.

If there is concern for an inflammatory, autoimmune, infectious, or metabolic condition, testing may include:

Rheumatoid factor

Anti-CCP antibodies when rheumatoid arthritis is suspected

ANA

ESR

CRP

HLA-B27 in selected clinical settings

Other investigations may be directed toward:

Gout

CPPD

Hemochromatosis

or infection.

Imaging

Plain Radiographs

Radiographs of the hand or individual affected digits are usually sufficient.

Typical findings include:

Joint-space narrowing

Subchondral sclerosis

Osteophyte formation

Subchondral cysts

Advanced Disease

Later changes may include:

Joint incongruity

Angular deformity

Bone loss

Partial subluxation

Ankylosis

Pathophysiology

Normal articular cartilage provides:

Low-friction movement

and

Shock absorption.

Osteoarthritis disrupts these functions through progressive structural and biochemical deterioration.

Early Cartilage Changes

Early degeneration may involve:

Increased cartilage water content

Altered proteoglycan metabolism

Collagen network disruption

These changes reduce the mechanical integrity of the cartilage.

Progressive Disease

As degeneration advances, cartilage develops:

Softening

Fissuring

Surface irregularity

Progressive loss of matrix

This leads to increased:

Friction

and reduced:

Shock-absorbing ability.

End-Stage Disease

With severe cartilage loss, abnormal load is transferred to:

Subchondral bone.

This may produce:

Microfracture

Sclerosis

Cyst formation

Osteophytes

Differential Diagnosis

Important alternative diagnoses include:

Gout

CPPD or pseudogout

Rheumatoid arthritis

Other inflammatory arthropathies

Septic arthritis

Post-traumatic arthritis

Gout

Gout may cause:

Acute painful swelling

Tophus formation

Erosive joint damage

Crystal identification from joint fluid can confirm the diagnosis when necessary.

CPPD

CPPD may mimic osteoarthritis but can involve:

Unusual joint distributions

and may show:

Chondrocalcinosis

on radiographs.

Rheumatoid Arthritis

Rheumatoid arthritis more commonly involves:

MCP

and

PIP joints

with relative sparing of the DIP joints.

Other clues include:

Prolonged morning stiffness

Symmetric swelling

Inflammatory laboratory abnormalities

Septic Arthritis

Acute severe pain, warmth, erythema, and swelling should raise concern for:

Joint infection, particularly if systemic symptoms are present.

Joint aspiration may be required.

Treatment

General Principles

Treatment aims to:

Reduce pain

Preserve hand function

Maintain useful motion

Correct severe deformity when necessary

Splinting

A well-padded splint can reduce:

Pain

Swelling

Mechanical irritation

Splinting is particularly useful during:

Symptomatic flare-ups

or for joints stressed repeatedly during activity.

Activity Modification

Patients should temporarily reduce or avoid activities that clearly aggravate symptoms.

Complete prolonged immobilization should generally be avoided because it may worsen:

Stiffness

Weakness

Physical Therapy and Hand Therapy

Therapy may include:

Active range-of-motion exercises

Passive stretching when appropriate

Isometric strengthening

Joint-protection techniques

The primary objective is to maintain:

Functional motion and strength.

Medication

Analgesic options may include:

Acetaminophen

and, when appropriate,

NSAIDs.

Topical NSAIDs can also be useful for superficial hand joints.

Corticosteroid Injection

Local corticosteroid injection may provide:

Temporary pain relief

for selected symptomatic joints.

Repeated injections should be used cautiously because of potential effects on:

Cartilage

Skin

Tendons

Surgery

Surgery is considered when:

Pain remains disabling despite conservative treatment

Severe deformity interferes with function

Motion is painful and nonfunctional

Joint destruction is advanced

MCP Joint

Surgical options include:

Arthroplasty

or

Arthrodesis

depending on the digit, disease pattern, and functional requirements.

PIP Joint

Options include:

Arthroplasty

or

Arthrodesis.

The choice depends on:

Which finger is involved

Need for mobility

Joint stability

Deformity

DIP Joint

For advanced painful DIP arthritis, the standard surgical treatment is usually:

Arthrodesis.

Fusion reliably reduces pain but sacrifices:

Joint motion.

Thumb CMC Joint

Surgical treatment of advanced thumb CMC arthritis may include:

Trapeziectomy

with or without:

Tendon interposition

Suspensionplasty

or other reconstructive procedures.

Thumb MCP Joint

Severe painful thumb MCP arthritis or instability may be treated with:

Arthrodesis.

Arthrodesis

The principal advantages of fusion are:

Reliable pain relief

Stable alignment

Strong functional joint

The disadvantage is:

Permanent loss of motion at the fused joint.

DIP Fusion Position

DIP arthrodesis is usually performed in:

Near extension to slight flexion, often approximately 0–25°.

More flexion may be used for the:

Ulnar digits

to improve functional grip.

PIP Fusion Position

PIP arthrodesis is commonly performed in greater flexion.

Approximately:

40° of flexion

may be used for the index or middle finger, with progressively more flexion toward the:

Ring and small fingers.

The exact angle should be individualized according to:

Digit

Occupation

Functional demands.

Arthroplasty

Several implant designs have been used for small-joint replacement.

Silicone implants remain widely used, particularly for selected PIP joints.

Other options include:

Pyrocarbon

and

Metal-polyethylene implants.

Some implant types have historically been associated with higher rates of:

Revision

Instability

or

Mechanical complications.

Arthroscopic Debridement

Small-joint arthroscopic debridement has been described in selected patients.

Its role is limited and it is not routinely used for:

Advanced end-stage arthritis.

Follow-Up

After joint fusion, an initial postoperative wound review is followed by radiographic assessment.

Radiographs are often obtained at approximately:

6 weeks

to evaluate progression toward fusion.

Additional imaging around:

12 weeks

may be required if union remains uncertain.

Prognosis

Most patients can achieve substantial improvement in:

Pain

Hand function

Daily activity

using combinations of:

Medication

Splinting

Hand therapy

Activity modification

or

Surgery.

Complications

Progressive Deformity

Untreated advanced arthritis may lead to:

Angular deformity

Loss of alignment

Functional impairment

Infection

Infection may occur after:

Injection

or

Surgery.

Arthrodesis Complications

Fusion procedures may be complicated by:

Malunion

Nonunion

Hardware irritation

Arthroplasty Complications

Implant arthroplasty may be complicated by:

Dislocation

Implant fracture

Wear

Loosening

Recurrent deformity

Silicone Synovitis

Silicone implants can rarely produce:

Silicone synovitis

secondary to implant wear debris.

Patient Monitoring

Patients managed nonoperatively can be reassessed according to:

Symptoms

Function

Progression of deformity

Historically, follow-up at approximately:

6–12-month intervals

has been used when ongoing surveillance is required.

Key Principle

Phalangeal joint arthritis is a degenerative process characterized by cartilage loss, osteophyte formation, subchondral change, pain, stiffness, and progressive deformity of the small joints of the hand.

Treatment begins with:

Activity modification, splinting, analgesia, and preservation of motion.

When pain and dysfunction remain severe, surgical options include:

Arthrodesis for reliable pain relief and stability

or

Arthroplasty when preservation of motion is important and the joint is suitable for replacement.

Orthopaedic Surgery - Perthes Disease

Basics

Perthes disease, also known as Legg–Calvé–Perthes disease, is a self-limited childhood disorder characterized by temporary interruption of the blood supply to the developing femoral head.

The resulting ischemic injury produces a sequence of:

Femoral head necrosis

Bone resorption

Fragmentation

Reossification

and ultimately

Healing and remodeling.

Although many children recover with a functional hip, severe disease can result in:

Femoral head collapse

Loss of sphericity

Hip incongruity

and later

Degenerative osteoarthritis.

Synonyms

Other names include:

Legg–Calvé–Perthes disease

and the historical term:

Osteochondritis deformans juvenilis.

Natural History

The disease progresses through several stages:

Ischemia or necrosis

Fragmentation and resorption

Reossification or repair

Healed/remodeled stage

The ultimate prognosis depends on how well the femoral head maintains or regains:

Sphericity

Containment

and

Congruence with the acetabulum.

Long-Term Degeneration

Residual femoral head deformity may lead to:

Femoroacetabular impingement

Loss of motion

Secondary osteoarthritis

and, in some patients,

Total hip arthroplasty later in life.

Historical long-term series have reported disabling arthritis in a substantial proportion of severely affected patients by middle or later adulthood.

Classification

Several radiographic classification systems are used to describe:

Extent of femoral head involvement

Stage of disease

and

Final shape after healing.

Lateral Pillar Classification

The Herring lateral pillar classification assesses preservation of the lateral portion of the femoral head during the fragmentation stage.

Group A

There is:

Essentially preserved height of the lateral pillar, with little or no collapse.

These lesions generally have the best prognosis.

Group B

More than approximately:

50% of lateral pillar height is maintained.

Group C

Less than approximately:

50% of lateral pillar height remains.

These lesions generally carry a less favorable prognosis.

A borderline B/C group is also recognized in modern use for hips that lie between classic B and C categories.

Modified Waldenström Classification

The modified Waldenström system describes:

The timing and stage of the disease process.

The stages include:

Initial stage

Fragmentation stage

Reossification or healing stage

Healed stage

Some modifications subdivide early stages according to:

Minimal versus greater flattening

and

Early versus advanced fragmentation.

Stulberg Classification

The Stulberg classification evaluates the:

Shape and congruence of the healed hip at skeletal maturity

and helps estimate the risk of later degenerative arthritis.

Stulberg Class I

Normal spherical femoral head and congruent hip.

Stulberg Class II

The femoral head remains:

Spherical

but may have abnormalities such as:

Shortened femoral neck

Coxa magna

or altered acetabular morphology.

Stulberg Class III

The femoral head is:

Nonspherical but not completely flat, often ovoid or mushroom-shaped.

Stulberg Class IV

The femoral head is:

Flat but remains relatively congruent with the acetabulum.

Stulberg Class V

The femoral head is:

Flat and incongruent with the acetabulum.

This carries the greatest risk of early degenerative change.

Epidemiology

Perthes disease most commonly affects children between:

4 and 10 years of age.

Cases have been reported from approximately:

2 years of age through adolescence.

Sex

Boys are affected approximately:

4–5 times more often than girls.

When girls develop the disease, the clinical course may sometimes be more severe because they often present at a later skeletal age.

Ethnicity

Historically, Perthes disease has been reported more commonly in:

White populations

and some

Asian populations

than in African-American and Native American populations.

Bilateral Disease

Approximately:

10% of patients

have bilateral involvement.

Bilateral disease is usually:

Asynchronous, with one hip affected before the other.

Symmetric Bilateral Disease

Simultaneous and symmetric epiphyseal abnormalities should raise suspicion for a systemic skeletal disorder rather than classic Perthes disease.

Examples include:

Hypothyroidism

Multiple epiphyseal dysplasia

Spondyloepiphyseal dysplasia

Incidence

Perthes disease is uncommon and affects substantially less than:

1% of children.

Reported incidence varies considerably by geographic and ethnic population.

Risk Factors

Reported associations include:

Small stature

Low birth weight in some populations

Older parental age

Urban residence

Certain ethnic backgrounds

Exposure to tobacco smoke in some studies

These associations do not establish a direct cause.

Genetics

A positive family history has been reported in approximately:

2–10% of cases.

No single inheritance pattern explains most cases.

Etiology

The exact cause remains unknown.

The central mechanism is believed to involve:

Temporary disruption of the blood supply to the femoral head.

Proposed Vascular Mechanisms

Potential contributors include:

Repeated vascular interruption

Venous hypertension or obstruction

Abnormal coagulation

Minor trauma

Anatomic vulnerability of the developing femoral head circulation

Hypercoagulability

Abnormal coagulation has been investigated as a possible contributor in selected patients.

Routine thrombophilia testing is not required in every child, but it may be considered when the presentation is:

Atypical

or associated with other thrombotic risk factors.

Trauma

Minor trauma may draw attention to symptoms or theoretically contribute to vascular compromise, but most cases are not explained by a single injury.

Associated Conditions

Children with Perthes disease may demonstrate:

Mild short stature

or delayed skeletal maturation.

Diagnosis

Diagnosis is based primarily on:

History

Physical examination

and

Plain radiographs.

Signs and Symptoms

The typical presentation is:

An insidious limp with little or only mild pain.

Limp

The limp is often the earliest and most noticeable symptom.

The child may demonstrate:

Shortened stance phase

Quick steps

or

Trunk lean over the affected side.

Trendelenburg-Type Gait

Weakness and altered hip mechanics may produce a:

Trendelenburg gait

with lateral trunk shift over the involved limb.

Pain

Pain may be:

Absent

or

Mild and activity related.

It typically improves with:

Rest.

Pain Location

Pain may be felt in the:

Groin

Anterior or medial thigh

or

Knee.

Referred knee pain can delay diagnosis if the hip is not examined.

Range of Motion

The earliest characteristic limitations are usually:

Hip abduction

and

Internal rotation.

Chronic Findings

With prolonged disease, the patient may develop:

Thigh atrophy

Calf atrophy

Gluteal atrophy

Leg-length discrepancy

History

Important questions include:

When did the limp begin?

Is there hip, thigh, or knee pain?

Is pain worse with activity?

Is there a history of trauma?

Have symptoms been progressive?

Physical Examination

Gait

Observe the child walking for:

Antalgic gait

Trendelenburg pattern

Shortened stance phase

Trunk shift

Hip Motion

Compare both hips for:

Internal rotation

External rotation

Abduction

Flexion

Restriction of:

Abduction and internal rotation

is particularly typical.

Pelvic Stabilization

When measuring abduction, stabilize the pelvis to prevent:

Pelvic tilt from falsely increasing apparent hip motion.

Muscle Bulk

Compare the thighs, calves, and buttocks for:

Atrophy or asymmetry.

Leg Length

Later disease may produce:

Apparent or true shortening of the affected limb

because of femoral head collapse and neck shortening.

Laboratory Tests

There is no diagnostic laboratory test for Perthes disease.

Laboratory studies may be ordered when another condition is suspected, such as:

Septic arthritis

Inflammatory disease

Endocrine disorder

Sickle cell disease

Imaging

Plain Radiographs

Radiographs are the most important routine imaging study.

Typical views include:

AP pelvis

and

Frog-leg lateral views, when clinically appropriate.

Initial Phase

Early findings may include:

Smaller appearance of the affected epiphysis

Widening of the medial joint space

Increased density of the femoral head

Physeal irregularity

Subchondral radiolucency

Crescent Sign

A subchondral radiolucent line may represent:

Subchondral fracture

and is sometimes called the:

Crescent sign.

Fragmentation Phase

During fragmentation:

Necrotic bone is resorbed

and the epiphysis develops:

Mixed areas of lucency and sclerosis

Fragmentation

Loss of height

Possible lateral extrusion

Reparative Phase

During reossification:

New bone density gradually returns.

The final shape of the:

Femoral head

and

Femoral neck

becomes increasingly apparent.

Healed Phase

Once healing is complete, residual deformity may include:

Coxa magna

Coxa breva

Short femoral neck

Flattened femoral head

Trochanteric overgrowth

Acetabular dysplasia

Head-at-Risk Signs

Classic radiographic findings associated with a less favorable prognosis include:

Gage sign

Lateral calcification

Lateral subluxation or extrusion of the femoral head

Horizontal physis

Gage Sign

The Gage sign is a:

V-shaped radiolucency along the lateral epiphysis.

It reflects significant lateral femoral head involvement.

MRI

MRI can detect:

Femoral head ischemia and marrow abnormalities

before radiographic changes are fully developed.

However, routine MRI is not always necessary when the diagnosis and stage are clear on plain radiographs.

Perfusion MRI

Contrast-enhanced perfusion MRI is increasingly used in specialized centers to evaluate:

Early femoral head perfusion

and may help estimate:

Prognosis

and

Potential response to containment procedures.

Arthrography

Hip arthrography can help assess:

Femoral head shape

Containability

Hip congruence

It may be particularly useful before surgery when plain radiographs do not fully define the relationship between the femoral head and acetabulum.

Pathological Findings

The underlying process is:

Ischemic necrosis of the femoral epiphysis.

Growth Plate

The physis may demonstrate:

Structural clefts and irregularities.

Bone Resorption

During fragmentation, resorption of necrotic bone may exceed new bone formation.

This temporarily weakens the femoral head and predisposes to:

Collapse and deformation.

Cartilage Changes

Cartilage may remain relatively viable even when underlying bone is necrotic.

Clusters of cartilage may extend toward the:

Metaphysis.

Differential Diagnosis

Important alternatives include:

Transient synovitis

Septic arthritis

Slipped capital femoral epiphysis

Juvenile idiopathic arthritis

Hypothyroidism

Multiple epiphyseal dysplasia

Spondyloepiphyseal dysplasia

Sickle cell disease

Gaucher disease

Glycogen storage disease

Osteoid osteoma

Pigmented villonodular synovitis

Steroid-associated osteonecrosis

Traumatic osteonecrosis

Tuberculous arthritis

Tumor

Fracture

Transient Synovitis

Transient synovitis may present with:

Limp

Hip pain

Reduced motion

but usually resolves over a much shorter period and does not produce progressive epiphyseal changes.

Septic Arthritis

Septic arthritis should be considered when there is:

Fever

Acute severe pain

Marked restriction of motion

Elevated inflammatory markers

This is an urgent diagnosis.

Slipped Capital Femoral Epiphysis

SCFE generally occurs in:

Older, often overweight adolescents

and produces characteristic displacement of the proximal femoral epiphysis rather than the ischemic fragmentation seen in Perthes disease.

Treatment

General Principles

The goals of treatment are to:

Maintain hip motion

Keep the femoral head contained within the acetabulum

Minimize collapse

Promote remodeling toward a spherical, congruent hip

Containment

Containment means maintaining the femoral head deeply seated within the acetabulum so that the acetabulum acts as a:

Mold during healing and remodeling.

Determining Containability

Containment is assessed using:

Plain radiographs

and, in selected cases,

Arthrography.

The hip is generally best contained in:

Abduction, provided the femoral head remains congruent.

Range of Motion

Preservation or restoration of:

Abduction

and

Internal rotation

is critical.

A stiff hip is difficult to contain and is associated with a worse prognosis.

Nonoperative Treatment

Many younger children can be managed with:

Observation

Activity modification

Physical therapy

Temporary protected weight bearing

provided the femoral head remains adequately contained.

Bracing and Casting

Historically, abduction braces and casts were used extensively to maintain containment.

They may still be used selectively, although prolonged bracing is less common in modern management than in older protocols.

Weight Bearing

If weight bearing causes significant pain, the child may use:

Crutches

or another method of protected ambulation.

Stiffness

If substantial stiffness develops, activity should be reduced and motion restored before further containment treatment is considered.

Physical Therapy

Physical therapy is useful for maintaining:

Hip range of motion

with particular emphasis on:

Abduction

and

Internal rotation.

Medication

Pain may be treated with age-appropriate doses of:

Acetaminophen

or

NSAIDs.

Surgery

Surgery is reserved for children whose age, stage, and degree of femoral head involvement suggest a significant risk of poor outcome without operative containment.

Age and Surgery

Children younger than approximately:

6 years

usually have excellent remodeling potential and often do not require surgery unless there is substantial:

Extrusion, loss of containment, or severe disease.

Older Children

Children presenting after approximately:

6–8 years of age

with extensive femoral head involvement are more likely to benefit from containment surgery.

Timing

Containment surgery is most effective before:

Advanced fragmentation and irreversible femoral head deformation.

Femoral Osteotomy

A proximal femoral varus osteotomy can position the femoral head:

More deeply within the acetabulum.

Internal fixation is used to maintain the correction while healing occurs.

Pelvic Osteotomy

A pelvic osteotomy may increase:

Acetabular coverage of the femoral head.

Procedures are selected according to:

Age

Hip anatomy

Containability

Surgeon preference

Combined Procedures

In selected severe cases, both:

Femoral

and

Pelvic osteotomy

may be used to improve containment.

Salvage Procedures

When the femoral head is no longer containable or major deformity has already developed, salvage procedures may be considered to:

Reduce pain

Improve motion

Correct impingement

Address leg-length discrepancy

Implant Removal

Internal fixation may be removed after osteotomy healing when appropriate, particularly in children who may require future reconstructive procedures.

Adult Reconstruction

Patients who later develop severe secondary osteoarthritis may ultimately require:

Total hip arthroplasty.

Follow-Up

All children with Perthes disease should be monitored by:

An orthopaedic surgeon, preferably one experienced in pediatric hip disorders.

Prognosis

The most important prognostic factor is:

Age at onset or healing.

Younger children have greater potential for:

Femoral head remodeling.

Children Younger Than 6 Years

Poor outcomes are relatively uncommon when onset occurs before approximately:

6 years of age, especially when disease involvement is limited.

Older Children

A less favorable prognosis is associated with presentation at:

8 years of age or older.

Other Poor Prognostic Factors

Additional unfavorable features include:

Extensive lateral pillar involvement

Poor hip range of motion

Femoral head extrusion

Loss of containment

Nonspherical healing

Hip incongruity

Symptoms After Healing

Many children become:

Pain-free during adolescence

after the active disease has healed.

However, residual deformity may later produce:

Impingement

Labral pathology

Degenerative arthritis

Long-Term Arthritis

Severe residual deformity substantially increases the risk of:

Premature hip osteoarthritis.

Some historical cohorts have reported eventual total hip replacement in a large proportion of severely affected patients by:

Middle or later adulthood.

Complications

Femoral Head Collapse

Loss of structural support during fragmentation may lead to:

Flattening and loss of sphericity.

Coxa Magna

The healed femoral head may become:

Enlarged and deformed.

Coxa Breva

Femoral neck growth disturbance may result in:

A shortened femoral neck.

Trochanteric Overgrowth

Relative overgrowth of the greater trochanter may impair:

Abductor mechanics

and contribute to:

Trendelenburg gait.

Leg-Length Discrepancy

Femoral neck shortening and growth disturbance can produce:

Limb shortening.

Loss of Motion

Patients may develop:

Flexion contracture

Adduction contracture

Reduced abduction

Reduced internal rotation

Degenerative Joint Disease

Residual incongruity can lead to:

Early osteoarthritis

and chronic adult hip pain.

Patient Monitoring

During the active disease phase, patients are commonly reviewed approximately every:

4–8 weeks, depending on severity and treatment.

Range-of-Motion Monitoring

Children using braces or casts should be periodically examined out of the device to assess:

Abduction

Internal rotation

Hip stiffness

Radiographic Monitoring

Serial radiographs are used to follow:

Fragmentation

Containment

Reossification

Femoral head shape

Duration of Containment

Historical brace or cast containment often continued for approximately:

6–18 months

or until sufficient reossification occurred and the risk of further collapse decreased.

Modern duration is individualized.

Follow-Up to Maturity

Patients with significant disease should continue follow-up through:

Skeletal maturity

to assess final hip shape, congruity, limb length, and function.

Key Principle

Perthes disease is a childhood ischemic disorder of the femoral head that progresses through necrosis, fragmentation, reossification, and healing.

The central treatment goals are:

Maintaining hip motion and preserving containment of the femoral head within the acetabulum while remodeling occurs.

The strongest predictors of outcome are:

Age at onset, extent of lateral pillar involvement, hip range of motion, and final femoral head congruity.

Orthopaedic Surgery - Peroneal Tendon Subluxation

Basics

Peroneal tendon subluxation is abnormal displacement of the peroneus longus and/or peroneus brevis tendons from their normal groove behind the lateral malleolus.

The two principal peroneal tendons are:

Peroneus longus

and

Peroneus brevis.

An accessory muscle, the:

Peroneus quartus

is variably present and has been reported in up to approximately 20% of individuals.

Anatomy

The peroneus longus and brevis pass posterior to the:

Lateral malleolus

within a common tenosynovial sheath.

They are stabilized by the:

Superior peroneal retinaculum

and more distally by the:

Inferior peroneal retinaculum.

The superior peroneal retinaculum is particularly important in maintaining the tendons within the:

Retromalleolar groove of the distal fibula.

Subluxation and Dislocation

When the superior peroneal retinaculum is torn, stretched, or developmentally insufficient, the tendons may translate:

Anteriorly over the lateral malleolus

during ankle motion.

This may produce:

Pain

Snapping

Clicking

or a:

Palpable tendon displacement.

The instability may be:

Acute after trauma

or

Chronic and recurrent.

Epidemiology

Peroneal tendon instability is:

Uncommon.

It is encountered most frequently in:

Active adolescents and adults, especially athletes.

Risk Factors

Athletic activities that place substantial stress on the lateral ankle increase risk.

Other predisposing factors include:

Generalized ligamentous laxity

Shallow or convex retromalleolar groove

Chronic ankle instability

Cavovarus or varus hindfoot alignment

Accessory peroneal musculature

Genetics

There is no established Mendelian inheritance pattern.

However, inherited anatomy such as:

Ligamentous laxity

or

Hindfoot alignment

may contribute indirectly.

Etiology

The classic acute mechanism involves:

Forceful ankle dorsiflexion

combined with:

Eversion

and strong contraction of the:

Peroneal muscles.

This can tear or strip the:

Superior peroneal retinaculum

from the distal fibula.

Sports Association

The injury is classically associated with:

Skiing

but may also occur in:

Running

Soccer

Basketball

Football

Dance

and other activities involving abrupt ankle loading.

Chronic or Spontaneous Instability

Some patients develop instability without a major traumatic event.

Predisposing anatomic factors may include:

A shallow fibular groove

Generalized ligamentous laxity

Varus hindfoot

Abnormal peroneal anatomy

Associated Conditions

Peroneal tendon subluxation may coexist with:

Chronic lateral ankle instability

Peroneus brevis split tear

Peroneal tenosynovitis

Cavovarus alignment

Generalized ligamentous laxity

Diagnosis

Diagnosis is based largely on:

History

Dynamic physical examination

and, when needed,

Imaging.

Because the tendons may be normally positioned at rest, dynamic evaluation is particularly important.

Signs and Symptoms

Patients commonly report:

Persistent posterolateral ankle pain

Pain with activity

Snapping or popping behind the fibula

A sensation of the tendons moving over the lateral malleolus

History

A typical history may involve:

A skier or running athlete

with:

Painful lateral ankle snapping

following an inversion/eversion-type injury or forceful dorsiflexion.

Patients may also report:

Repeated ankle sprains

or

Chronic instability.

Acute Presentation

Following an acute injury, there may be:

Swelling

Ecchymosis

Tenderness posterior to the lateral malleolus

Chronic Presentation

Chronic cases may have relatively little swelling but demonstrate:

Reproducible painful snapping

during active ankle movement.

Physical Examination

Inspection

Inspect the posterolateral ankle for:

Swelling

Bruising

Visible tendon displacement

Hindfoot alignment

Neurovascular Examination

Assess:

Distal pulses

Sensation

Motor function

because lateral ankle trauma can occasionally involve nearby neurologic structures.

Ankle Stability

Evaluate the lateral ligament complex using:

Anterior drawer testing

and

Talar tilt or inversion stress testing.

This is important because chronic peroneal instability may coexist with:

Lateral ligament instability.

Provocative Maneuver

The patient can be asked to move from:

Plantarflexion and eversion

into:

Dorsiflexion with active eversion.

This contracts the peroneal muscles and may reproduce:

Posterolateral pain

Snapping

or

Visible/palpable tendon subluxation.

Palpation

The examiner should palpate directly:

Behind the lateral malleolus

while the patient repeatedly:

Inverts and everts the foot

or performs resisted ankle motion.

The tendons may be felt moving:

Anteriorly over the fibula.

Normal Tendon Clicking

Peroneal tendons may occasionally:

Snap or click within their sheath

without actual instability.

Therefore, the finding is clinically meaningful when there is:

True displacement from the groove

together with:

Reproduction of the patient’s pain or symptoms.

Laboratory Tests

There are no specific laboratory tests for isolated peroneal tendon subluxation.

Imaging

Plain Radiographs

Initial ankle radiographs help assess for:

Fracture

Bony avulsion

Hindfoot alignment

A small avulsion fragment from the posterolateral distal fibula may indicate injury to the:

Superior peroneal retinaculum.

Historically, such avulsion fractures have been reported in approximately:

10% of acute cases.

CT

CT can define:

The shape and depth of the retromalleolar groove

and other bony anatomy.

It may be helpful for:

Preoperative planning

when groove morphology is abnormal.

MRI

MRI can demonstrate:

Superior peroneal retinacular tearing or attenuation

Peroneal tenosynovitis

Fluid within the tendon sheath

Peroneus brevis longitudinal split tear

Associated ligamentous injuries

MRI is also useful for identifying chronic tendon degeneration.

Dynamic Ultrasound

Dynamic musculoskeletal ultrasound is particularly useful because the tendons can be observed:

During active ankle movement.

It may directly demonstrate:

Subluxation or dislocation over the lateral malleolus.

Because instability may not be present at rest, dynamic ultrasound can sometimes be more informative than static imaging.

Diagnostic Injection

A local anesthetic injection into the:

Peroneal tendon sheath

may occasionally help determine whether pain originates from the peroneal tendons.

This can be useful when the diagnosis remains uncertain.

Pathological Findings

Possible findings include:

Shallow retromalleolar groove

Torn or attenuated superior peroneal retinaculum

Peroneal tenosynovitis

Longitudinal split tear of the peroneus brevis

Chronic Instability

Repeated subluxation can cause friction and progressive damage to the:

Peroneus brevis tendon, particularly a longitudinal split tear.

Differential Diagnosis

Important alternative diagnoses include:

Lateral ankle sprain

Chronic ankle instability

Lateral malleolar fracture

Peroneal tendon tear

Posterolateral ankle impingement

Osteochondral lesion of the talus

Sural nerve irritation

Treatment

General Principles

Treatment depends on whether the instability is:

Acute or chronic

and on the patient’s:

Activity level

Symptoms

Associated tendon injury

Acute Nonoperative Treatment

For a first-time acute injury, an initial period of nonoperative treatment may be attempted.

Options include:

Cast immobilization

Walking boot

Rest

Ice

NSAIDs when appropriate

Immobilization

Immobilization aims to allow the:

Superior peroneal retinaculum

to heal while preventing recurrent tendon displacement.

A period of immobilization is generally more effective for:

Acute injuries

than for established chronic instability.

Chronic Cases

Longstanding recurrent subluxation is less likely to respond to:

Casting or bracing alone.

Persistent painful instability often requires:

Operative stabilization.

Bracing and Taping

An ankle brace may reduce tendon excursion and improve symptoms.

Athletes may also use:

Taping

or

Lateral crescent/J-shaped pads

to help maintain the tendons behind the lateral malleolus.

These methods are primarily:

Symptom-control strategies

rather than definitive treatment for major structural instability.

Activity Modification

Reducing or avoiding the activity that provokes subluxation may help selected patients.

This is particularly reasonable when symptoms occur only with:

A specific high-demand movement or sport.

Physical Therapy

Physical therapy alone is generally insufficient to correct:

True mechanical peroneal tendon instability.

However, it is valuable for treating associated:

Weakness

Poor proprioception

Chronic ankle instability

and is especially important after surgery.

Rehabilitation Goals

Therapy should address:

Peroneal strengthening

Ankle range of motion

Balance

Proprioception

Neuromuscular control

Sport-specific function

Medication

NSAIDs may be used during the acute phase or rehabilitation to reduce:

Pain

and

Inflammation.

They do not correct the mechanical instability.

Surgery

Operative treatment is appropriate for:

Recurrent symptomatic subluxation

Failure of nonoperative treatment

Associated tendon tear

High-demand athletes requiring reliable stability

Competitive Athletes

High-level athletes may undergo earlier surgical treatment when recurrent instability is likely to interfere substantially with:

Return to play

and

Performance.

Surgical Principles

Surgery should address all contributing abnormalities rather than treating only the retinaculum.

Options include:

Superior peroneal retinacular repair

Peroneal tendon repair

Retromalleolar groove deepening

Correction of associated hindfoot malalignment when necessary

Retinacular Repair

When the superior peroneal retinaculum has been avulsed or torn, it can be:

Reattached or reconstructed

to restore the normal tunnel behind the fibula.

Groove Deepening

Patients with a:

Shallow or convex retromalleolar groove

may benefit from:

Fibular groove-deepening procedures

combined with retinacular repair.

This increases the bony containment of the tendons.

Tendon Repair

If a concomitant:

Peroneus brevis split tear

or other tendon lesion is present, treatment may include:

Debridement

Tubularization

or

Direct tendon repair.

Historical Procedures

Older procedures include:

Bone-block techniques

and

Tendon rerouting procedures beneath adjacent ligamentous structures.

These are now used less commonly because anatomic repair of the retinaculum and groove generally preserves more normal biomechanics.

Follow-Up

Postoperative rehabilitation is gradual.

Early treatment typically includes:

Immobilization

followed by progressive:

Range of motion

Strengthening

Proprioceptive training

Return to Activity

Patients may begin progressively increasing activity after approximately:

2–3 months, depending on healing and surgical technique.

Return to full competitive sports commonly requires approximately:

4–6 months, sometimes longer.

Prognosis

Chronic symptomatic instability has a relatively low likelihood of resolving permanently with conservative treatment alone.

Patients undergoing appropriate surgical stabilization generally achieve:

Good pain relief

Improved tendon stability

and

Return to athletic activity.

Complications

Potential surgical complications include:

Recurrent subluxation

Persistent pain

Peroneal tendon stiffness or adhesions

Sural nerve injury

Sural nerve entrapment

Sural neuroma

Recurrence

Recurrent instability may occur if:

Retinacular healing fails

Underlying groove abnormality is not corrected

Rehabilitation progresses too rapidly

Sural Nerve Injury

Because the sural nerve passes near the posterolateral ankle, surgery can result in:

Numbness

Neuropathic pain

or

Neuroma formation.

Patient Monitoring

Follow-up should assess:

Pain

Tendon stability

Range of motion

Peroneal strength

Ankle stability

Proprioception

Readiness to return to sport

Rehabilitation commonly requires renewed training in:

Ankle strengthening and proprioceptive control.

Key Principle

Peroneal tendon subluxation is dynamic instability of the peroneus longus and/or brevis tendons behind the lateral malleolus, usually caused by injury or insufficiency of the superior peroneal retinaculum.

The characteristic finding is:

Painful snapping with palpable or visible anterior displacement of the tendons over the distal fibula during ankle motion.

Acute injuries may be treated initially with immobilization, whereas:

Chronic, recurrent, or high-demand athletic cases frequently require surgical restoration of the retinaculum and associated anatomic abnormalities.

Orthopaedic Surgery - Pectoralis Major Tendon Rupture

Basics

Pectoralis major tendon rupture is an injury involving the pectoralis major muscle-tendon unit, most commonly near its insertion on the proximal humerus.

The pectoralis major contributes importantly to:

Shoulder adduction

Internal rotation

and

Forward flexion, particularly through the clavicular head.

The sternocostal portion contributes strongly to:

Adduction and internal rotation.

Anatomy

The pectoralis major originates from:

Clavicle

Sternum

Upper ribs and costal cartilages

External oblique aponeurosis

The tendon inserts on the proximal humerus along the:

Lateral lip of the intertubercular groove, or crest of the greater tubercle.

Tendon Orientation

The tendon has a twisted configuration.

The lower sternocostal fibers rotate before insertion so that the inferior fibers insert relatively:

More proximally on the humerus.

This complex orientation is important during:

Surgical reconstruction.

Classification

Pectoralis major injuries may be classified by severity.

Type I

Muscle strain or microscopic tearing.

The structural continuity of the muscle-tendon unit remains intact.

Type II

Partial tear.

Only a portion of the muscle or tendon is disrupted.

Type III

Complete rupture.

There is complete disruption of the affected component of the pectoralis major muscle-tendon unit.

Classification by Location

Injuries may also be described according to location:

Muscle origin

Muscle belly

Musculotendinous junction

Tendon substance

Humeral insertion

The most common complete ruptures occur near the:

Humeral tendon insertion

or

Musculotendinous junction.

Prevention

Preventive measures include:

Avoiding sudden excessive loads during heavy bench pressing

Using progressive resistance training

Maintaining proper lifting technique

Avoiding anabolic-androgenic steroid misuse

The risk is particularly high when the arm is heavily loaded in:

Extension and external rotation.

Epidemiology

Pectoralis major rupture occurs predominantly in:

Men in their 20s to 40s.

It is strongly associated with:

Athletic and resistance-training activities.

Sports Association

A large proportion of injuries occur during:

Weight lifting

particularly:

Bench press

Other reported activities include:

Wrestling

Jujitsu

Gymnastics

Contact sports

Incidence

The true incidence is:

Unknown

but recognition has increased as participation in high-intensity resistance training has become more common.

Risk Factors

Important risk factors include:

Heavy resistance training

Power lifting

Bench pressing

Anabolic steroid use

Anabolic Steroids

Anabolic steroids have been proposed to increase rupture risk through:

Disproportionately rapid increases in muscle strength

and possible alterations in:

Tendon structure and stiffness.

The resulting imbalance between muscular force production and tendon capacity may predispose to failure.

Pathophysiology

The clinical consequences depend on:

The location

Extent

and

Chronicity

of the tear.

Partial injuries are often:

Intramuscular

or located at the:

Musculotendinous junction.

Complete ruptures most commonly occur near:

The tendon insertion on the humerus.

Etiology

Strains and Partial Tears

These are more common than complete ruptures.

They may involve:

Muscle fibers

Musculotendinous junction

or a portion of the tendon.

Complete Rupture

Complete rupture usually results from:

Sudden forceful overload of an eccentrically contracting pectoralis major.

The classic mechanism occurs during the:

Lowering phase of a heavy bench press.

Bench-Press Mechanism

The muscle is placed under maximal tension when the shoulder is:

Extended

Abducted

and

Externally rotated.

A sudden overload in this position may cause:

Avulsion of the tendon from its humeral insertion.

Diagnosis

Diagnosis is usually based primarily on:

History

and

Physical examination.

Imaging is particularly useful when the diagnosis is uncertain or surgical treatment is being considered.

Signs and Symptoms

Patients often report:

Sudden severe pain in the anterior shoulder, chest, or upper arm

at the moment of injury.

Audible Pop

Many patients describe:

A snap or pop

at the time of rupture.

Acute Findings

Other common symptoms include:

Swelling

Bruising

Weakness

Painful or limited shoulder motion

History

Important questions include:

What activity was being performed?

Was a heavy bench press involved?

Was there a sudden eccentric load?

Was a pop heard or felt?

Did immediate bruising or deformity develop?

Does the patient use anabolic steroids?

Physical Examination

Inspection

Inspection may reveal:

Swelling

Ecchymosis

Anterior chest-wall hematoma

Axillary bruising

Upper-arm bruising

Anterior Axillary Fold

A complete rupture may cause loss or thinning of the:

Anterior axillary fold.

The affected side may demonstrate:

Flattening

A visible sulcus

or

Asymmetry compared with the opposite side.

Deltopectoral Groove

A visible depression may develop along the:

Deltopectoral region

because of tendon retraction.

Muscle Bunching

When the patient contracts the muscle, the pectoralis major may:

Retract medially

creating a visible or palpable bulge closer to the chest wall.

Palpable Defect

A complete rupture may produce a:

Distinct palpable gap

between the retracted muscle-tendon unit and the humeral insertion.

This finding is more suggestive of a full-thickness tear than a partial injury.

Tenderness

Tenderness is often maximal near the:

Humeral tendon insertion

or

Anterior axillary fold.

Strength Testing

Manual testing usually demonstrates weakness of:

Shoulder adduction

and

Internal rotation.

Forward flexion may also be weakened.

Comparison With Contralateral Side

The opposite side should be examined for comparison of:

Axillary contour

Muscle tension

Strength

Palpable tendon continuity

Imaging

Plain Radiographs

Plain radiographs are useful initially to exclude:

Proximal humeral fracture

Other bony injury

and, rarely,

Bony avulsion from the humeral insertion.

Radiographs are usually normal in isolated soft-tissue rupture.

Ultrasonography

Ultrasound can help identify:

Tendon discontinuity

Hematoma

Retraction

Location of the tear

It is:

Rapid

Relatively inexpensive

and

Dynamic

but is highly dependent on:

Operator experience.

MRI

MRI is the preferred advanced imaging modality when precise characterization is required.

It can determine:

Partial versus complete rupture

Location of the tear

Degree of tendon retraction

Acute versus chronic changes

Muscle quality

MRI Field of View

Routine shoulder MRI may not adequately visualize the entire pectoralis major.

The examination should include:

The anterior chest wall, axilla, and humeral insertion.

A dedicated pectoralis major MRI protocol is often preferable.

Acute MRI Findings

Acute tears may demonstrate:

Tendon discontinuity

Edema

Hemorrhage

Hematoma

Retraction of the muscle-tendon unit

Chronic MRI Findings

Chronic injuries may show:

Scar tissue

Tendon retraction

Muscle atrophy

Fatty change

These findings help determine whether primary repair remains feasible.

Diagnostic Procedures

Pectoralis major rupture is often diagnosed:

Clinically.

MRI is particularly valuable for:

Confirming tear pattern

and

Planning surgery.

Pathological Findings

At surgery, findings may include:

Torn tendon fibers

Torn muscle fibers

Hematoma

Scar tissue in chronic injuries

Chronic Changes

Delayed presentation may result in:

Tendon shortening

Scar formation

Muscle atrophy

and occasionally

Poor tissue quality.

Differential Diagnosis

Important alternatives include:

Pectoralis major muscle strain

Partial pectoralis major tear

Proximal humerus fracture

Coracoid avulsion fracture

Anterior shoulder injury

Treatment

Management may be:

Nonoperative

or

Operative

depending on:

Extent of injury

Location

Age

Functional demand

Cosmetic expectations

Initial Stabilization

During the acute phase, the arm may be supported in:

A sling

or

Sling and swathe.

Initial treatment also includes:

Ice

Analgesia

Control of swelling and hematoma

Nonoperative Treatment

Nonoperative treatment may be appropriate for:

Contusions

Muscle strains

Partial tears

Muscle-belly tears

Low-demand or sedentary patients with complete tears

Goals of Nonoperative Care

Management includes:

Rest

Temporary sling immobilization

Pain control

Ice

Gradual restoration of motion

Expected Results of Nonoperative Treatment

Patients may regain:

Useful functional motion

and satisfactory daily function.

However, complete tears treated nonoperatively often result in persistent:

Loss of adduction strength

Reduced internal-rotation strength

Loss of shoulder flexion strength

Visible cosmetic deformity

Individualized Decision-Making

Treatment should reflect the patient’s:

Age

Occupation

Sports requirements

Functional demands

Cosmetic concerns

A sedentary older adult may reasonably prefer nonoperative care, whereas:

Competitive athletes and high-demand individuals

often benefit from operative repair.

Nonoperative Rehabilitation

Passive and active motion may begin relatively early as pain allows.

A typical progression includes:

Gentle range of motion during the first several weeks

followed by

Progressive strengthening once pain-free motion is restored.

Strengthening

Light resistance may begin at approximately:

6–8 weeks

when symptoms and healing permit.

Resistance is then gradually increased.

Return to Heavy Training

Progression toward heavier resistance may occur around:

3–4 months or later

depending on recovery.

Some patients should avoid repeated:

Very-heavy, low-repetition bench pressing, particularly after a significant rupture.

Return to Contact Sport

Return to collision or contact sport generally requires:

Full motion

Near-symmetric strength

No pain

and often occurs around:

5–6 months or later.

Physical Therapy

Physical therapy is important once acute pain and swelling improve.

The goals include:

Restoring range of motion

Maintaining scapular mechanics

Progressively strengthening the shoulder

Returning safely to sport or work

Strength Progression

Resistance exercises should begin only when:

Motion is comfortable

and

The acute hematoma and inflammatory response have resolved.

Medication

NSAIDs may be used for:

Short-term pain and inflammation control, when appropriate.

Short-duration opioid medication may occasionally be required for:

Severe acute pain

or

Immediate postoperative pain.

Surgery

Surgical repair is generally favored for:

Complete tendon ruptures in young or active patients

especially when the tear is at or near the:

Humeral insertion.

Benefits of Surgical Repair

Operative repair generally provides better restoration of:

Strength

Preinjury activity level

Cosmetic contour

Patient satisfaction

than nonoperative treatment of complete tears.

Timing of Surgery

Repair is technically easier when performed:

Early after injury.

Delayed repair may be complicated by:

Retraction

Scar formation

Tendon shortening

However, good outcomes may still be achieved in many chronic cases.

Repair According to Tear Location

The surgical technique depends on:

Where the muscle-tendon unit has failed.

Musculotendinous Junction Tear

A repairable tear at the musculotendinous junction may require:

Direct suturing of the torn ends.

Tendon or Humeral Insertion Tear

Tendon avulsion from the humerus is typically repaired by reattaching the tendon to its anatomic footprint using:

Suture anchors

Cortical buttons

Transosseous tunnels

or other fixation techniques.

Chronic Retracted Tears

If the tendon cannot reach the humeral insertion without excessive tension, reconstruction may require:

Interposition grafting

or

Tendon augmentation.

Autograft or allograft tissue may be used depending on the defect.

Postoperative Immobilization

Following repair, the shoulder is usually protected in a:

Sling

with the arm maintained in:

Adduction

Internal rotation

and slight flexion.

Protection typically lasts approximately:

4–6 weeks.

Early Postoperative Motion

Pendulum or Codman exercises may begin early when permitted.

Excessive:

Abduction

and

External rotation

are avoided initially because they increase tension across the repair.

Six-Week Rehabilitation

Around 6 weeks, many protocols begin:

Gentle passive range of motion in multiple planes

together with:

Periscapular strengthening

Isometric exercises

Three-Month Rehabilitation

By approximately:

3 months

the goal is usually:

Near-full range of motion

with progression into:

Light resistance exercise.

Later Strengthening

Over the following several months, resistance is progressively increased.

Return to unrestricted activity may occur around:

6 months

provided adequate healing, motion, and strength have been restored.

Heavy Bench Pressing After Repair

Even after successful repair, repeated:

High-weight, low-repetition pectoralis loading

may be discouraged because it recreates the mechanism associated with rupture.

Follow-Up

The patient is generally reviewed approximately:

10–14 days after surgery

for:

Wound evaluation

Suture or staple removal when appropriate

Ongoing Follow-Up

During rehabilitation, periodic review assesses:

Range of motion

Strength

Pain

Repair integrity

Progression of activity

Follow-up intervals are individualized but may initially occur every:

Several weeks.

Prognosis

The overall prognosis is:

Good.

Most patients regain useful shoulder motion and strength.

Operative Prognosis

For complete tears in active patients, operative management generally provides the best chance of restoring:

Preinjury strength

Sports participation

Work capacity

Normal anterior axillary contour

Nonoperative Prognosis

Patients treated nonoperatively may function well in daily activities but commonly retain some reduction in:

Adduction

Internal rotation

Forward-flexion strength

and may have a persistent cosmetic defect.

Complications

Complications are uncommon but may include:

Re-rupture

Hematoma

Infection

Heterotopic ossification

Stiffness

Persistent weakness

Failure to return to previous activity level

Re-Rupture

Re-rupture may occur with:

Premature heavy loading

New trauma

Failure of fixation

Adherence to rehabilitation restrictions is important.

Persistent Weakness

Incomplete restoration of strength may result from:

Chronic tear

Muscle atrophy

Tendon elongation

Incomplete rehabilitation

Patient Monitoring

Patients should be monitored for:

Wound healing

Axillary contour

Range of motion

Adduction strength

Internal-rotation strength

Progressive return to activity

Key Principle

Pectoralis major tendon rupture most commonly occurs in young to middle-aged men during forceful eccentric loading, classically during the lowering phase of a heavy bench press.

The hallmark findings are:

Sudden pain, bruising, loss of the anterior axillary fold, palpable tendon discontinuity, and weakness of shoulder adduction and internal rotation.

Complete tears in active patients are generally best treated with:

Early anatomic surgical repair followed by protected, progressive rehabilitation.

Orthopaedic Surgery - Pathological Fracture

⸻

Basics

A pathological fracture is a fracture that occurs through abnormal or structurally weakened bone rather than normal bone.

The normal bone may have been replaced by:

Tumor

Cystic tissue

Fibrous tissue

Metabolic bone abnormality

or may simply have been:

Destroyed by the underlying disease process.

As a result, the affected bone may no longer tolerate normal physiologic loading.

A fracture may therefore occur during:

Ordinary activities of daily living

or after trauma that would normally be insufficient to fracture healthy bone.

The underlying process may be:

Benign

or

Malignant.

⸻

Geriatric Considerations

In older adults, pathological fractures are most commonly associated with:

Metastatic carcinoma

Multiple myeloma

Lymphoma

Less commonly, the fracture may occur through a primary malignant bone tumor such as:

Chondrosarcoma

or

Undifferentiated pleomorphic sarcoma of bone, historically termed malignant fibrous histiocytoma.

⸻

Pediatric Considerations

In children and adolescents, common benign causes include:

Unicameral bone cyst

Nonossifying fibroma

Fibrous dysplasia

Important malignant causes include:

Osteosarcoma

and

Ewing sarcoma.

⸻

Prevention

A pathological fracture cannot always be prevented, particularly when the underlying lesion has not yet been diagnosed.

However, many patients experience:

Activity-related bone pain before fracture occurs.

When a destructive lesion is identified before fracture, reducing mechanical stress and considering prophylactic stabilization may prevent progression to a complete fracture.

⸻

Epidemiology

The likely underlying diagnosis depends strongly on:

Patient age

Anatomic location

and

Radiographic appearance.

⸻

Children and Adolescents

Common benign lesions associated with pathological fracture include:

Unicameral bone cyst, especially in the proximal humerus or proximal femur

Nonossifying fibroma

Fibrous dysplasia

Important malignant lesions include:

Osteosarcoma

Ewing sarcoma

⸻

Adults

Benign causes include:

Giant cell tumor

Fibrous dysplasia

Malignant causes include:

Metastatic bone disease

Multiple myeloma

Lymphoma

Primary bone sarcoma

⸻

Older Adults

In geriatric patients, malignant disease becomes increasingly important.

Common causes include:

Metastatic carcinoma

Multiple myeloma

Lymphoma

Less common primary skeletal malignancies include:

Chondrosarcoma

Undifferentiated pleomorphic sarcoma

⸻

Risk Factors for Impending Fracture

Fracture risk increases as destruction of the:

Cortex

and

Overall structural integrity

progresses.

Historically, destruction of more than approximately:

50% of the cortical diameter

has been considered a major risk factor for pathological fracture.

Assessment should be made using:

AP and lateral radiographs

and, when necessary,

CT.

⸻

Role of CT in Fracture-Risk Assessment

CT can define:

Cortical destruction

Lesion length

Circumferential bone involvement

Remaining structural bone

more accurately than plain radiographs in selected patients.

⸻

Genetics

There is no single genetic abnormality associated with pathological fracture itself.

Genetic factors depend on the:

Underlying bone disorder or neoplasm.

⸻

Pathophysiology

Normal long-bone strength depends heavily on:

Cortical thickness

Bone diameter

Bone geometry

Trabecular architecture

Any process that destroys or replaces normal bone reduces its ability to withstand:

Bending

Compression

Torsion

⸻

Cortical Destruction

Experimental data demonstrate that substantial cortical involvement can dramatically decrease bone strength.

Historically:

Approximately 50% symmetric cortical involvement has been associated with about a 60% reduction in bending strength.

Approximately 50% asymmetric cortical involvement may reduce strength by as much as 90%.

⸻

Lesion Length

Long lytic lesions are particularly dangerous.

A defect whose length exceeds approximately:

The diameter of the involved bone

may result in major loss of:

Torsional strength.

⸻

Associated Conditions

Any condition that sufficiently replaces or weakens normal bone can predispose to pathological fracture.

Examples include:

Bone metastases

Multiple myeloma

Primary bone tumors

Bone cysts

Fibrous dysplasia

Metabolic bone disease

⸻

Diagnosis

⸻

Signs and Symptoms

The two most important findings are:

Bone pain

and

Localized bone tenderness.

⸻

Pain Before Fracture

Before a complete fracture occurs, patients may report:

Moderate or severe pain during weight bearing or activity.

This pain may initially be:

Intermittent

and later become:

Present with nearly all activity.

Persistent focal bone pain in a patient with a known destructive lesion should raise concern for:

Impending pathological fracture.

⸻

Pain After Fracture

Once a complete fracture occurs, patients usually develop:

Sudden severe pain

which is worsened markedly by:

Movement

Weight bearing

or

Palpation.

⸻

History

Important historical features include:

Duration of pain

Relationship of pain to activity

Known cancer diagnosis

Previous radiation therapy

Previous skeletal lesions

Recent weight loss or constitutional symptoms

Prior fractures

Minimal-trauma mechanism

⸻

Physical Examination

Before fracture, examination may be:

Nearly normal.

⸻

Tenderness

Palpation may reveal:

Localized bone tenderness.

Marked tenderness over a known lesion suggests:

Mechanical weakness or impending fracture.

⸻

Soft-Tissue Mass

A palpable mass may be present in:

Primary malignant tumors

or

Aggressive metastatic lesions with cortical breakthrough.

⸻

Range of Motion

Joint motion should be assessed:

Gently.

Forceful examination should be avoided because an unstable lesion may fracture during manipulation.

⸻

Neurovascular Examination

A complete examination should assess:

Motor function

Sensation

Distal pulses

particularly when a large mass or displaced fracture is present.

⸻

Laboratory Tests

Laboratory testing is guided by the suspected underlying cause.

Although laboratory studies do not diagnose the fracture itself, they may help identify:

Multiple myeloma

Metabolic bone disease

Hypercalcemia

Renal dysfunction

Anemia

or other systemic abnormalities.

Potential tests include:

CBC

Calcium

Creatinine

Alkaline phosphatase

Serum protein electrophoresis

Serum free light chains

and other investigations based on clinical suspicion.

⸻

Imaging

Imaging is central to the evaluation.

⸻

Plain Radiographs

AP and lateral radiographs of the entire involved bone are usually the:

First diagnostic study.

They should assess both:

The fracture

and

The underlying lesion.

⸻

Radiographic Features

Important findings include:

Lytic bone destruction

Sclerosis

Cortical thinning

Cortical breakthrough

Periosteal reaction

Soft-tissue mass

Matrix mineralization

⸻

Host Bone Reaction

A benign-appearing lesion may demonstrate:

A sclerotic rim

Cortical thickening

Well-defined margins

Aggressive lesions are more likely to demonstrate:

Poorly defined margins

Cortical destruction

Soft-tissue extension

⸻

CT

CT may help determine:

The pattern of cortical destruction

Amount of remaining bone

Mineralized tumor matrix

Fracture configuration

Extent of a soft-tissue mass

It can also assist with:

Biopsy planning

and

Operative planning.

⸻

MRI

MRI is particularly useful for evaluating:

Marrow involvement

Soft-tissue extension

Relationship to neurovascular structures

Extent of a primary bone tumor

Associated skip lesions in selected sarcomas

⸻

Whole-Bone Imaging

When a malignant bone tumor is suspected, the entire involved bone should be imaged to evaluate for:

Additional lesions

and to assist with planning of:

Biopsy and definitive resection.

⸻

Diagnostic Strategy

The diagnostic pathway depends heavily on whether the lesion appears:

Benign

or

Malignant/aggressive.

⸻

Lesion With Malignant Features

When radiographs suggest malignancy, staging should be performed before definitive biopsy whenever possible.

This may include:

CT of the chest

Additional body imaging based on suspected primary tumor

Whole-body skeletal staging

MRI of the lesion

⸻

Search for a Primary Carcinoma

In an adult with an unknown destructive bone lesion, evaluation may include imaging of:

Chest

Abdomen

Pelvis

and other investigations guided by the suspected primary malignancy.

⸻

Biopsy

If biopsy is required, it should be performed:

After appropriate staging

and with the biopsy tract planned so that it can be removed during definitive tumor surgery if necessary.

Biopsy should ideally be coordinated by:

An orthopaedic oncologist or musculoskeletal tumor team.

⸻

Benign-Appearing Lesions

When radiographs are characteristic of a known benign lesion such as:

Unicameral bone cyst

Nonossifying fibroma

Fibrous dysplasia

treatment may sometimes proceed without biopsy.

If the diagnosis is uncertain, tissue diagnosis is appropriate before definitive treatment.

⸻

Pathological Findings

Histologic findings depend entirely on:

The underlying lesion.

The fracture itself may demonstrate:

Hemorrhage

Callus formation

Reactive bone

superimposed on the pathologic process.

⸻

Differential Diagnosis

The differential diagnosis depends primarily on:

Age

Anatomic site

Radiographic appearance

⸻

Young Patient With Benign-Appearing Lesion

Consider:

Unicameral bone cyst

Nonossifying fibroma

Fibrous dysplasia

⸻

Young Patient With Aggressive Lesion

Consider:

Osteosarcoma

Ewing sarcoma

Osteomyelitis

⸻

Adult With Aggressive Lesion

Consider:

Metastatic carcinoma

Multiple myeloma

Lymphoma

Primary bone sarcoma

⸻

Treatment

⸻

Initial Stabilization

Many patients experience pain for:

Weeks to months before fracture.

When activity-related pain is present in a bone containing a destructive lesion, loading should be reduced promptly.

⸻

Walking Aids

Depending on the site and severity, options include:

Walker

Two crutches

Cane