Orthopaedic Surgery - Spondylolisthesis

Basics

Spondylolisthesis is:

Abnormal translation of one vertebral body relative to the adjacent vertebra.

Most commonly, the upper vertebral body moves:

Anteriorly

relative to the vertebra below it.

Relationship to Spondylolysis

Spondylolisthesis may develop because of a defect in the:

Pars interarticularis

known as:

Spondylolysis

or because of failure or degeneration of other:

Posterior ligamentous and bony stabilizers.

Classification

Spondylolisthesis is classified according to:

Etiology

and

Severity of vertebral translation.

Major Types

The principal categories include:

Isthmic

Dysplastic or congenital

Degenerative

Traumatic

Pathologic

and

Iatrogenic spondylolisthesis.

Isthmic Spondylolisthesis

Isthmic spondylolisthesis results from a defect in the:

Pars interarticularis.

This defect most often develops as a:

Stress fracture

during childhood or adolescence.

Degenerative Spondylolisthesis

Degenerative spondylolisthesis occurs because of:

Disc degeneration

Facet-joint degeneration

and subsequent:

Segmental instability.

It most commonly affects:

L4–L5

in older adults.

Prevention

There is no proven strategy that reliably prevents development or progression of:

Spondylolisthesis.

Bracing

Long-term brace treatment has historically been proposed to limit progression, but because substantial progression is:

Uncommon

routine prolonged bracing for asymptomatic slips is generally:

Not recommended.

Bracing may nevertheless be used temporarily for:

Pain control

in selected symptomatic adolescents.

Epidemiology

Isthmic spondylolysis and spondylolisthesis generally begin during:

Childhood or adolescence.

The prevalence increases slightly during:

Adolescent growth.

Adult Prevalence

By adulthood, spondylolysis or related spondylolisthesis affects approximately:

5–6% of the population

in many historical series.

Age of Onset

Pars defects are:

Not present at birth

in typical isthmic disease.

They generally appear after children begin:

Walking and loading the spine.

The condition is rarely seen before approximately:

5–6 years of age.

Sex

Isthmic disease has historically been reported more often in:

Males.

However, females may demonstrate:

Greater slip progression

and may develop more substantial vertebral translation at a younger age.

Degenerative Disease

Degenerative spondylolisthesis predominantly affects:

Older adults

and is more common in:

Women.

Level

Isthmic spondylolysis occurs most commonly at:

L5

with translation of L5 over:

S1.

Degenerative spondylolisthesis occurs most frequently at:

L4–L5.

Risk Factors

Important risk factors include:

Positive family history

Repetitive lumbar hyperextension

High-impact adolescent sports

Generalized connective-tissue laxity

and selected:

Skeletal disorders.

Athletic Activities

Activities repeatedly loading the lumbar spine in:

Extension

may increase the risk of developing a pars stress injury.

Examples include:

Gymnastics

Football lineman activities

Diving

Weight lifting

and other sports involving repetitive:

Hyperextension and rotation.

Genetics

A positive family history increases the likelihood of:

Spondylolysis and spondylolisthesis.

Historical reports suggest approximately:

One-quarter of affected patients

may have a family history of the disorder.

Associated Genetic Disorders

The risk of vertebral translation may be increased in conditions associated with:

Bone weakness

or

Connective-tissue laxity.

Examples include:

Osteogenesis imperfecta

and some heritable:

Connective-tissue disorders.

Etiology

The underlying mechanism differs according to the:

Type of spondylolisthesis.

Isthmic Etiology

Isthmic disease usually begins as a:

Stress fracture through the pars interarticularis.

Repeated mechanical loading prevents normal healing and may produce:

Fibrous nonunion or pseudoarthrosis.

Development of Listhesis

A pars defect alone does not necessarily produce vertebral translation.

Progression to spondylolisthesis requires additional deformation or failure through:

The intervertebral disc

and surrounding:

Soft-tissue restraints.

Degenerative Etiology

Degenerative spondylolisthesis develops through progressive:

Disc degeneration

Facet arthrosis

and loss of:

Segmental stability.

Associated Conditions

Most patients are otherwise:

Neurologically and systemically normal.

However, increased risk may occur with:

Marfan syndrome

Neuromuscular disease

Athetoid cerebral palsy

and other disorders associated with:

Spinal instability or connective-tissue laxity.

Diagnosis

Diagnosis is based on:

History

Physical examination

and

Imaging.

It is important to determine whether the observed spondylolisthesis is actually responsible for the patient’s:

Symptoms.

Signs and Symptoms

Symptoms may begin:

Insidiously

or follow relatively minor:

Trauma or repetitive athletic loading.

Back Pain

Patients may complain of:

Low-back pain

sometimes extending into the:

Buttocks

or

Posterior thighs.

Radicular Pain

L5 nerve-root irritation may cause:

Sciatica

Numbness

or

Weakness

in an:

L5 distribution.

Gait Abnormality

Patients with more significant slips may develop:

Abnormal gait

or altered:

Pelvic and lumbar posture.

Posture

High-grade slips may produce compensatory:

Pelvic retroversion

and alterations in:

Lumbar lordosis.

Depending on the deformity, patients may appear either unusually:

Hyperlordotic

or relatively:

Hypolordotic.

Trauma History

Symptoms may appear after:

Acute trauma

or more commonly after repetitive:

Sports-related microtrauma.

Physical Examination

The examination should include assessment of:

Gait

Spinal alignment

Lumbar motion

Hamstring flexibility

and

Neurologic function.

Lumbar Extension

Pain is often increased by:

Lumbar hyperextension

particularly in patients with active:

Pars stress injury or spondylolysis.

Forward and Backward Bending

Assess:

Flexion

Extension

and

Rotation.

Restricted motion may reflect:

Pain

Hamstring tightness

or advanced deformity.

Hamstring Tightness

Patients with significant spondylolisthesis may develop marked:

Hamstring tightness.

This may limit:

Straight-leg raising

and

Forward flexion.

Limited Straight-Leg Raise

A limited straight-leg-raise test associated with marked hamstring tightness may be seen in:

High-grade spondylolisthesis

particularly in adolescents.

Neurologic Examination

A complete neurologic assessment should include:

Motor strength

Sensation

Reflexes

and evaluation for:

Radiculopathy.

L5 Radiculopathy

Severe slips may stretch or compress the:

L5 nerve root.

Possible findings include weakness of:

Ankle dorsiflexion

Great-toe extension

and

Hip abduction.

Cauda Equina Assessment

In patients with severe neurologic symptoms, assess for:

Saddle anesthesia

Urinary dysfunction

Bowel dysfunction

and progressive:

Lower-extremity weakness.

Laboratory and Electrodiagnostic Tests

Routine laboratory testing is generally:

Not required.

Electromyography

EMG and nerve-conduction studies may occasionally help evaluate:

L5 nerve-root dysfunction

when the neurologic diagnosis remains:

Uncertain.

Imaging

Plain Radiographs

Conventional radiographs are the initial study for diagnosing and grading:

Spondylolisthesis.

Lateral Radiograph

A standing:

Lateral lumbar radiograph

shows the degree of:

Vertebral translation.

For L5–S1 disease, a focused lateral view centered on:

L5–S1

can improve visualization.

AP Radiograph

An AP view helps evaluate:

Alignment

Spinal deformity

and associated:

Congenital abnormalities.

Oblique Views

Oblique radiographs historically have been used to visualize the:

Pars interarticularis.

The pars represents the:

Neck of the “Scotty dog.”

A pars defect may appear as a break through the:

Dog’s neck.

Because oblique views add radiation and may not always improve diagnosis, they are used more selectively in modern practice.

Flexion-Extension Radiographs

Dynamic views can assess:

Segmental motion

and

Instability.

They are particularly useful in:

Degenerative

or

Iatrogenic spondylolisthesis.

MRI

MRI is useful for identifying:

Early stress reaction

before a complete pars defect develops.

MRI Findings in Early Spondylolysis

MRI may show:

Bone marrow edema

or stress reaction around the:

Pars interarticularis.

Neural Compression

MRI is also useful for determining the degree of:

Nerve-root compression

Central canal stenosis

and

Foraminal stenosis.

Disc Assessment

MRI can evaluate the condition of adjacent discs, particularly the:

L4–L5 disc

when planning treatment for:

L5–S1 disease.

CT

CT provides excellent visualization of:

Cortical bone

and is highly useful for detecting:

Pars defects

Sclerosis

and

Chronic nonunion.

SPECT

Technetium bone scintigraphy with SPECT has historically been used to identify:

Metabolically active pars stress injuries

when radiographs are normal or equivocal.

MRI is now frequently preferred because it avoids:

Ionizing radiation.

Diagnostic Blocks

In selected difficult cases, injections around a pars defect or other suspected pain source may help determine whether the lesion is:

Symptomatic.

Discography is used much less commonly because of:

Limited specificity

and its invasive nature.

Classification by Etiology

Isthmic

Associated factors include:

Family history

Gymnastics

Football line play

and repetitive:

Lumbar hyperextension.

Dysplastic or Congenital

This form results from congenital abnormalities of the:

Lumbosacral junction

that predispose the vertebra to:

Progressive slip.

It may be associated with abnormalities such as:

Spina bifida occulta.

Pathologic

Pathologic spondylolisthesis may result from structural weakening caused by:

Tumor

Infection

or other destructive:

Bone disease.

Traumatic

Acute traumatic spondylolisthesis follows fracture or disruption of:

Posterior spinal elements

other than a chronic pars stress defect.

It may be associated with:

Neurologic injury.

Degenerative

Degenerative disease typically affects older adults, particularly during the:

Sixth and seventh decades.

It occurs most frequently at:

L4–L5.

Iatrogenic

Iatrogenic spondylolisthesis may follow removal of stabilizing posterior structures during:

Prior spinal surgery.

Meyerding Grading

Severity is commonly described by the percentage of:

Anterior vertebral translation.

Grade 0

No measurable slip

although a pars defect may still be present.

Grade I

Translation of:

0–25%.

Grade II

Translation of:

26–50%.

Grade III

Translation of:

51–75%.

Grade IV

Translation of:

76–100%.

Grade V

Complete displacement beyond the supporting vertebra is called:

Spondyloptosis.

Pathological Findings

The common lesion in isthmic disease is a defect through the:

Pars interarticularis.

Chronic Pars Defect

A longstanding defect may demonstrate:

Fibrous nonunion

Pseudoarthrosis

and

Reactive sclerosis.

Nerve Compression

Fibrous tissue at the pars defect or foraminal narrowing associated with translation may compress the:

L5 nerve root.

Differential Diagnosis

The presence of a pars defect or spondylolisthesis does not prove that it is the source of:

Pain.

Many patients have asymptomatic:

Radiographic abnormalities.

Important Alternatives

Other causes of low-back or leg pain include:

Lumbar disc herniation

Degenerative disc disease

Facet arthropathy

Spinal stenosis

Tumor

Infection

and other causes of:

Radiculopathy.

L4–L5 Disc Disease

A patient with L5–S1 isthmic spondylolisthesis may actually have symptoms from an:

L4–L5 disc herniation

or degeneration.

Clinical and imaging findings should therefore be carefully:

Correlated.

Treatment

Treatment depends on:

Age

Symptoms

Slip grade

Slip progression

Neurologic findings

and underlying:

Etiology.

Children and Adolescents

Most symptomatic low-grade slips can initially be treated:

Nonoperatively.

Activity Modification

Painful extension-based activities should be reduced until:

Symptoms resolve

and painless motion returns.

Bracing

A lumbar brace may be used for several months in selected adolescents with:

Symptomatic active pars lesions

or painful:

Low-grade spondylolisthesis.

Its purpose is mainly to:

Reduce pain and limit extension

rather than reliably reverse an established slip.

Nonoperative Outcomes

Historical series report good or excellent outcomes in up to approximately:

90% of appropriately selected young patients.

Observation

Once symptoms resolve, patients may be followed clinically.

Serial radiographs may be obtained every:

1–2 years until skeletal maturity

when there is concern for:

Slip progression.

Failure of Nonoperative Treatment

Surgery may be considered when symptoms persist despite approximately:

6–12 months of appropriate conservative management

or when the patient has a:

Symptomatic high-grade slip.

Adults

Adults with low-grade disease and symptoms consistent with mechanical back pain are often initially treated with:

Nonoperative measures.

Higher-Grade Adult Slips

More advanced symptomatic slips may require:

Fusion

and, when neural compression is present,

Nerve-root decompression.

Management depends on the specific pathology rather than grade alone.

Activity

Asymptomatic patients with low-grade stable spondylolisthesis generally do not require:

Routine activity restriction.

Symptomatic Patients

Activities should be reduced until the patient regains:

Painless lumbar motion

and adequate:

Core and hamstring function.

Physical Therapy

Physical therapy commonly emphasizes:

Hamstring stretching

Core stabilization

Abdominal strengthening

and control of excessive:

Lumbar extension.

Lumbar Posture

Historically, exercises aimed at reducing excessive:

Lumbar lordosis

have been used to decrease extension stress across the:

Pars.

Medication

Medication may include standard treatment for:

Mechanical low-back pain.

Options include:

Acetaminophen

NSAIDs

and, in selected short-term circumstances,

Muscle relaxants.

Surgery

Surgery is considered for:

Persistent disabling pain

Progressive neurologic deficit

High-grade slip

Progressive deformity

or failed:

Nonoperative treatment.

Direct Pars Repair

In selected young patients with:

Symptomatic pars defects

without substantial disc degeneration or high-grade translation, direct repair of the:

Pars interarticularis

may preserve:

Spinal motion.

Posterolateral Fusion

A traditional procedure for symptomatic L5–S1 spondylolisthesis is:

Posterolateral L5–S1 fusion.

Instrumented Fusion

Modern fusion commonly uses:

Pedicle-screw instrumentation

to improve:

Mechanical stability

and

Fusion rate.

Decompression

When significant L5 radiculopathy is present, the:

L5 nerve root

may require adequate:

Foraminal decompression.

Reduction

Whether a high-grade slip should be:

Reduced

or fused largely:

In situ

remains individualized.

Reduction may improve:

Alignment

but can place the:

L5 nerve roots

under substantial traction.

Anterior Column Support

Severe slips may occasionally require:

Interbody or anterior-column fusion

to improve stability and:

Fusion probability.

Levels of Fusion

The number of levels included depends on:

Slip severity

Lumbosacral alignment

Adjacent disc health

and

Patient age.

Follow-Up

Patients treated nonoperatively should be monitored for:

Pain

Neurologic symptoms

and

Progression of slip.

Skeletally Immature Patients

Children and adolescents with remaining growth may require periodic:

Standing lateral radiographs

until:

Skeletal maturity.

Postoperative Follow-Up

After fusion, follow-up evaluates:

Alignment

Neurologic status

Implant position

and development of:

Solid fusion.

Prognosis

Most patients with low-grade spondylolisthesis have a:

Favorable prognosis.

Low-Grade Slips in Children

Most symptomatic low-grade slips in children and adolescents respond to:

Nonoperative treatment

and do not result in long-term:

Disability.

Back Pain Risk

Spondylolisthesis may modestly increase the likelihood of:

Chronic low-back pain

but many patients remain:

Asymptomatic.

Slip Progression

Major progression is uncommon after:

Skeletal maturity

particularly in low-grade:

Isthmic slips.

Degenerative slips may progress with continued:

Disc and facet degeneration.

Complications

Lumbar Radiculopathy

L5 radiculopathy may occur because of:

Foraminal narrowing

Fibrous tissue

or progression of:

Vertebral translation.

Neurologic Injury With Reduction

One of the most important complications of surgical reduction is:

L5 nerve-root injury.

This may produce:

Pain

Sensory loss

or

Motor weakness.

Cauda Equina Syndrome

Very severe slips may rarely cause compression of the:

Cauda equina

resulting in:

Saddle anesthesia

Bowel dysfunction

Bladder dysfunction

and

Lower-extremity weakness.

This requires:

Urgent evaluation.

Pseudarthrosis

Spinal fusion may fail to achieve solid union, resulting in:

Pseudarthrosis.

This can lead to:

Persistent pain

Implant failure

or need for:

Revision surgery.

Adjacent-Segment Degeneration

Long-term fusion may increase mechanical loading at adjacent spinal levels and contribute to:

Degenerative changes.

Patient Monitoring

Monitoring should focus on:

Pain severity

Neurologic function

Gait

Hamstring tightness

Slip progression

and development of:

Radicular or cauda equina symptoms.

Key Principle

Spondylolisthesis is abnormal translation of one vertebra relative to another, most commonly caused by either a:

Pars interarticularis defect in isthmic disease

or

Disc and facet degeneration in degenerative disease.

The condition is graded according to the percentage of vertebral slip:

Grade I up to 25%, Grade II 26–50%, Grade III 51–75%, Grade IV 76–100%, and Grade V representing spondyloptosis.

Most low-grade slips, especially in children and adolescents, can be treated with:

Activity modification, physical therapy, analgesia, and selective bracing.

Surgery is reserved for:

Persistent disabling symptoms, progressive neurologic deficit, high-grade or progressive slips, or failed nonoperative treatment, with procedures ranging from:

Pars repair to decompression and instrumented spinal fusion.

Orthopaedic Surgery - Spine Fusion

Basics

Spinal fusion, or:

Spinal arthrodesis

is a surgical procedure designed to create:

Permanent bony union between two or more vertebral levels.

The goal is to eliminate abnormal motion and provide long-term:

Stability

Alignment

and, when required,

Correction of deformity.

Purpose of Fusion

Spinal fusion may be performed to treat instability resulting from:

Developmental abnormalities

Trauma

Degenerative disease

Deformity

or

Previous surgery.

It may also be used to prevent progression of:

Spinal deformity.

Biological Principle

The biological process of spinal fusion resembles:

Fracture healing.

Bone graft or another osteogenic material is placed between selected vertebral surfaces so that new bone progressively bridges the:

Fusion site.

Until solid fusion develops, stability may be provided by:

Internal fixation

such as screws, rods, hooks, or other implants.

Instrumentation Versus Fusion

Spinal instrumentation and spinal fusion are related but distinct concepts.

Instrumentation provides mechanical stability with implants.

Fusion refers to the eventual biological formation of:

Continuous living bone between vertebrae.

Instrumentation generally supports the spine while the fusion:

Matures.

Epidemiology

The number of spinal fusion procedures performed in adults has increased substantially over recent decades.

Historical U.S. data demonstrated that the rate of spinal fusion:

More than doubled over approximately two decades.

The frequency varies considerably according to:

Diagnosis

Age

and

Spinal region.

Risk Factors for Complications

Several patient factors can reduce the likelihood of successful fusion or increase:

Postoperative complications.

Diabetes Mellitus

Diabetes mellitus is associated with an increased risk of:

Postoperative infection

and may also impair:

Bone healing.

Optimizing perioperative:

Blood glucose control

is therefore important.

Tobacco Use

Smoking is one of the major modifiable risk factors for:

Pseudarthrosis

or failure of the intended fusion to heal.

Nicotine and other components of tobacco exposure adversely affect:

Bone formation

Blood supply

and

Fusion biology.

Smoking cessation should therefore be strongly encouraged:

Before and after surgery.

Other Factors Affecting Fusion

Additional factors that may impair fusion include:

Advanced age

Poor nutrition

Osteoporosis

Vitamin D deficiency

Long-term corticosteroid exposure

Large fusion constructs

and selected:

Medical comorbidities.

Indications

Spinal fusion may be indicated for a variety of disorders.

Common examples include:

Congenital scoliosis

Idiopathic scoliosis

Kyphosis

Spondylolisthesis

Degenerative scoliosis

Spinal fractures

and

Postoperative or iatrogenic instability.

Congenital Scoliosis

Fusion may be used to prevent progression of deformity resulting from abnormal vertebral development such as:

Hemivertebra

or

Failure of segmentation.

Idiopathic Scoliosis

In progressive scoliosis exceeding appropriate operative thresholds, fusion may be combined with:

Spinal instrumentation

to correct deformity and maintain:

Long-term alignment.

Kyphosis

Severe or progressive kyphosis may require fusion when it causes:

Deformity

Pain

Progression

or

Neurologic compromise.

Spondylolisthesis

Fusion may be indicated when vertebral translation is associated with:

Instability

Neurologic compression

Progressive deformity

or persistent symptoms despite:

Nonoperative treatment.

Degenerative Disease

In degenerative spinal disease, fusion may be added to decompression when there is:

Instability

Spondylolisthesis

Significant deformity

or when surgical decompression is expected to create:

Iatrogenic instability.

Fusion is not required for every patient undergoing:

Spinal decompression.

Spinal Fractures

Unstable spinal fractures may require:

Internal fixation

and sometimes:

Fusion

to restore and maintain:

Spinal stability.

Postsurgical Instability

Previous decompression or other spinal surgery may occasionally weaken the supporting structures enough to produce:

Iatrogenic instability.

Fusion may then be required to restore:

Mechanical stability.

Diagnosis and Assessment

Fusion itself is not a diagnosis but rather a:

Treatment procedure.

Postoperative evaluation focuses on determining whether the intended vertebral levels have formed a:

Solid bony union.

Signs and Symptoms of Successful Fusion

A successfully fused patient may demonstrate:

Improved pain

Improved function

and no clinical evidence of:

Segmental instability.

However, symptoms alone cannot reliably confirm:

Bony union.

Symptoms of Possible Pseudarthrosis

Failure of fusion may present with:

Persistent axial pain

Recurrent pain after initial improvement

Mechanical pain with activity

or, less commonly,

Implant failure.

Some pseudarthroses remain:

Asymptomatic.

Imaging

Plain Radiographs

Conventional radiographs are routinely used to assess:

Alignment

Instrumentation

and progression of:

Fusion maturation.

Bridging Bone

The strongest radiographic evidence of a mature fusion is:

Continuous bridging bone

across the intended:

Fusion site.

Hardware Assessment

Radiographs can also identify:

Screw or rod breakage

Implant migration

Loss of correction

and

Adjacent-segment degeneration.

Flexion-Extension Radiographs

Dynamic radiographs may be useful when:

Pseudarthrosis

or persistent instability is suspected.

Abnormal motion across the intended fusion site suggests:

Incomplete union.

CT

CT with multiplanar reconstructions is particularly useful when the status of fusion is:

Uncertain.

CT Findings

CT can assess:

Bridging trabecular bone

Graft incorporation

Fusion across facet joints

and areas of:

Persistent lucency or nonunion.

Suspected Pseudarthrosis

When pseudarthrosis is suspected, evaluation commonly includes:

CT

and

Conventional radiographs, sometimes with flexion-extension views.

Factors Determining Fusion Success

The probability of successful arthrodesis depends on both:

Patient-related

and

Surgical factors.

Age

Bone-healing capacity generally decreases with:

Advancing age

although chronological age alone does not determine whether fusion will succeed.

Surgical Technique

Adequate:

Preparation of the fusion bed

Mechanical stability

and

Appropriate fixation

are important for successful fusion.

Rigid Internal Fixation

Rigid instrumentation can reduce motion across the fusion site and improve the mechanical environment for:

Bone healing.

Bone Graft

Bone graft provides material to promote:

New bone formation

and is a central component of many fusion procedures.

Nutrition

Adequate nutrition, including sufficient:

Protein

Calcium

and

Vitamin D

supports normal:

Bone healing.

Smoking Status

Continued smoking significantly increases the likelihood of:

Delayed union

and

Pseudarthrosis.

Physical Therapy

Physical therapy may help patients restore:

Walking ability

General conditioning

Balance

and

Functional mobility.

Need for Physical Therapy

Formal therapy is not mandatory after every uncomplicated:

Spinal fusion.

Its use depends on:

Procedure

Patient mobility

Pain

Preoperative conditioning

and

Surgeon preference.

Patients Who May Benefit Most

Physical therapy can be particularly useful for patients with:

Deconditioning

Gait impairment

Persistent weakness

or difficulty returning to:

Daily activities.

Surgery

Surgical Approach

Spinal fusion may be performed through:

Posterior

Anterior

Lateral

or combined approaches.

The choice depends on:

Spinal level

Pathology

Deformity

Need for neural decompression

and the desired:

Biomechanical correction.

Posterior Fusion

Posterior fusion provides access to:

Posterior spinal elements

and allows use of techniques such as:

Pedicle screw fixation

Facet preparation

and

Posterolateral bone grafting.

Anterior Fusion

An anterior approach provides direct access to:

Intervertebral discs

and

Vertebral bodies.

It may be useful when correction or reconstruction is required primarily through the:

Anterior column.

Interbody Fusion

Fusion may also be performed through the:

Intervertebral disc space.

After disc removal, an:

Interbody cage

or structural graft may be inserted to restore:

Disc height

and promote:

Anterior-column fusion.

Instrumentation

Modern fusion constructs may use:

Pedicle screws

Rods

Hooks

and, in selected circumstances, other fixation systems.

Historical techniques also included:

Sublaminar wires.

Pedicle Screws

Pedicle screws provide strong fixation through the:

Posterior vertebral elements

into the:

Vertebral body.

They are commonly connected with rods to maintain:

Alignment

and

Stability.

Bone Graft Sources

Fusion may use:

Local autograft

Iliac crest autograft

Rib graft

Fibular graft

or

Allograft.

The optimal graft depends on the:

Procedure

Amount of graft required

and

Patient factors.

Autograft

Autograft contains the patient’s own:

Living bone cells

and

Osteogenic proteins.

Iliac crest autograft has traditionally been considered an effective graft source but may cause:

Donor-site pain

and other morbidity.

Local Bone Graft

Bone removed during decompression can often be reused as:

Local autograft

which avoids a separate:

Donor site.

Allograft

Allograft provides:

Structural or cancellous bone

without donor-site morbidity.

Its biological incorporation may differ from:

Autograft.

Bone Morphogenetic Protein

Bone morphogenetic proteins are naturally occurring signaling molecules involved in:

Bone formation.

Recombinant BMP may be delivered on a carrier to promote:

Spinal fusion

in selected procedures.

BMP Considerations

Use of BMP depends on:

Spinal region

Surgical approach

Patient characteristics

and regulatory indications.

Potential adverse effects vary with the location and method of:

Application.

Decompression With Fusion

When spinal stenosis or nerve compression is present, fusion may be combined with:

Laminectomy

Foraminotomy

or

Discectomy.

The objective is both to:

Decompress neural structures

and maintain or restore:

Spinal stability.

Follow-Up

During the first postoperative year, patients generally require:

Regular surgical follow-up.

Early Follow-Up

Initial visits assess:

Wound healing

Neurologic status

Pain

Implant position

and early:

Spinal alignment.

Fusion Maturation

Subsequent visits evaluate for:

Progressive bridging bone

and evidence that the intended fusion is:

Maturing appropriately.

Long-Term Follow-Up

After solid fusion develops, continued surveillance may be appropriate for:

Adjacent-segment degeneration

Junctional deformity

Hardware-related symptoms

or recurrence of:

Neurologic symptoms.

Adjacent-Segment Degeneration

Fusion eliminates motion at one or more spinal levels.

The adjacent mobile segments may subsequently experience altered:

Mechanical loading.

Over time, this can contribute to:

Disc degeneration

Facet arthritis

Stenosis

or

Spondylolisthesis

above or below the fusion.

Adjacent-Segment Disease

Radiographic degeneration alone does not necessarily produce:

Symptoms.

The term adjacent-segment disease generally refers to degeneration that becomes:

Clinically symptomatic.

Prognosis

The prognosis varies according to:

Underlying diagnosis

Number of levels fused

Patient health

Bone quality

Smoking status

Adjacent-segment condition

and

Surgical technique.

Patient-Reported Outcomes

Recovery is also influenced by:

Baseline disability

Psychosocial factors

Work demands

and expectations regarding:

Pain and function.

Historical studies have reported less favorable average outcomes in some patients involved in workers’ compensation or litigation, but these associations are multifactorial and should not be interpreted as determining an individual patient’s:

Outcome.

Pseudarthrosis

Pseudarthrosis means failure to develop a:

Solid bony fusion

at the intended level.

Pseudarthrosis Rate

Rates depend greatly on:

Procedure

Number of levels

Smoking

Bone quality

and

Instrumentation.

Historical series have reported rates around:

10% in some fusion procedures.

Asymptomatic Pseudarthrosis

Not every pseudarthrosis causes:

Pain

or requires:

Revision surgery.

Treatment depends on symptoms, instability, deformity, and:

Implant integrity.

Complications

Failure to Restore Function

Even with technically successful fusion, some patients may continue to have:

Pain

Weakness

or

Functional limitations.

Infection

Possible postoperative infection may involve:

Skin

Deep soft tissues

Bone

or

Instrumentation.

Risk is increased by factors such as:

Diabetes

Poor nutrition

and other causes of:

Impaired immunity.

Neurologic Injury

Neurologic injury is an important but uncommon complication.

Historical estimates vary according to the operation, with rates in some series around:

1–5%.

Possible consequences include injury to:

Nerve roots

Spinal cord

or

Cauda equina.

Dural Tear

An unintended:

Dural tear

may result in leakage of:

Cerebrospinal fluid.

This is more common in:

Revision surgery

and procedures involving extensive:

Decompression.

Implant Failure

Instrumentation may occasionally develop:

Loosening

Breakage

or

Migration.

This is more likely when there is:

Pseudarthrosis

or poor:

Bone quality.

Adjacent-Segment Degeneration

Fusion may accelerate mechanical stress at adjacent segments and contribute to earlier:

Degenerative changes.

Not all such changes are clinically significant.

Junctional Problems

Long spinal constructs may develop:

Proximal or distal junctional kyphosis

and, in severe cases,

Junctional failure.

This is particularly relevant in:

Older adults

and patients with:

Osteoporosis.

Activity After Surgery

Activity restrictions vary according to:

Procedure

Spinal level

Fixation

and

Surgeon preference.

First 6 Weeks

During approximately the first:

6 weeks

patients commonly restrict:

Heavy lifting

Repetitive bending

Twisting

and other activities that place substantial stress on the:

Healing construct.

Walking is generally encouraged as tolerated.

Return to Activity

Activity is gradually increased according to:

Pain

Neurologic status

Radiographic healing

and

Overall recovery.

Six-Month Period

By approximately:

6 months

many patients can return to most routine activities if healing has progressed appropriately.

Some patients are advised to continue avoiding:

High-impact sports

Very heavy lifting

or other activities with substantial:

Spinal loading.

Fusion Healing Time in Adults

In adults, a fusion may require approximately:

6 months

to become reasonably solid.

Biologic remodeling and strengthening may continue for as long as:

1–2 years.

Fusion Healing in Children

Children generally heal more rapidly.

A mature fusion may achieve substantial strength within approximately:

6–12 months.

Patient Monitoring

Follow-up should assess:

Pain

Wound healing

Neurologic function

Mobility

Spinal alignment

and evidence of:

Fusion maturation.

Radiographic Monitoring

Serial radiographs evaluate:

Alignment

Implant position

and developing:

Bridging bone.

CT is reserved for cases in which fusion status remains:

Uncertain

or pseudarthrosis is suspected.

Risk-Factor Modification

Long-term management should address modifiable factors that impair fusion or increase future spinal problems, particularly:

Smoking

Poor glycemic control

Malnutrition

and

Poor bone health.

Key Principle

Spinal fusion is a surgical arthrodesis that joins two or more vertebral levels through formation of solid bridging bone.

It is used to treat:

Instability, deformity, spondylolisthesis, selected fractures, degenerative conditions, and postsurgical instability.

Successful fusion depends on both:

Biological healing and mechanical stability, supported by appropriate bone grafting and instrumentation.

Important factors that impair fusion include:

Smoking, diabetes, poor nutrition, osteoporosis, and advanced age.

The major complications include:

Pseudarthrosis, infection, neurologic injury, implant failure, and adjacent-segment degeneration.

Patients require ongoing follow-up until:

Solid fusion is established, with longer-term surveillance when appropriate for adjacent-level degeneration or other late complications.

Orthopaedic Surgery - Spinal Stenosis

Basics

Spinal stenosis is:

Narrowing of the spinal canal, lateral recesses, or neural foramina

that results in compression of:

The spinal cord

Cauda equina

or

Spinal nerve roots.

In the lumbar spine, the condition is most commonly caused by:

Degenerative changes.

Degenerative Causes

Important degenerative abnormalities include:

Disc-space narrowing

Disc bulging

Facet-joint hypertrophy

Osteophyte formation

and

Hypertrophy or infolding of the ligamentum flavum.

Together, these changes reduce the space available for:

Neural structures.

Clinical Features

Lumbar spinal stenosis commonly causes:

Lower-extremity pain

Numbness

Paresthesia

Weakness

and

Neurogenic claudication.

Severe compression may occasionally produce:

Bladder

or

Bowel dysfunction.

Prevention

There are no established measures that reliably prevent:

Degenerative spinal stenosis.

However, maintaining:

General fitness

Healthy body weight

and appropriate management of musculoskeletal disease may improve overall:

Spinal function.

Epidemiology

Symptoms commonly develop during or after the:

Fifth and sixth decades of life

and may gradually progress with:

Advancing age.

Sex

Degenerative lumbar spinal stenosis overall has no strong:

Sex predominance.

However, degenerative:

Spondylolisthesis associated with stenosis

has historically been reported approximately:

Four times more frequently in women.

Incidence

Historical estimates suggest symptomatic spinal stenosis affects approximately:

1.7–8% of the population.

The prevalence increases substantially with:

Age.

Risk Factors

Important risk factors include:

Advancing age

Degenerative spinal arthritis

Disc degeneration

and conditions producing:

Spinal instability or deformity.

Genetics

There is no single established:

Genetic abnormality

responsible for typical degenerative spinal stenosis.

Some congenital skeletal disorders, however, may predispose to a:

Narrow spinal canal.

Pathophysiology

Lumbar spinal stenosis commonly develops through a progressive cascade of:

Disc degeneration

followed by secondary:

Facet and ligamentous changes.

Disc Degeneration

Degeneration leads to loss of:

Intervertebral disc height.

As the disc loses height, the annulus may:

Bulge posteriorly

into the spinal canal.

Ligamentum Flavum

Loss of disc height also allows the:

Ligamentum flavum

to buckle or infold into the:

Spinal canal.

The ligament may additionally become:

Hypertrophied.

Facet Loading

Loss of disc height transfers greater load to the:

Facet joints.

Facet Arthrosis

Increased mechanical loading produces:

Cartilage degeneration

Reactive sclerosis

Facet hypertrophy

and

Osteophyte formation.

These changes further narrow the:

Central canal

Lateral recesses

and

Neural foramina.

Neural Compression

The final result is reduced space for:

Nerve roots

and the:

Cauda equina.

Symptoms may be worsened dynamically when lumbar extension further decreases:

Canal dimensions.

Etiology

Spinal stenosis may be:

Congenital

or

Acquired.

Congenital Causes

Congenital causes include:

Skeletal dysplasias such as achondroplasia

and

Idiopathic developmental narrowing of the spinal canal.

Acquired Causes

Acquired causes include:

Degenerative disease

Spondylolisthesis

Spondylolytic abnormalities

Previous spinal surgery

Posttraumatic deformity

and

Paget disease.

Degenerative Stenosis

Degenerative disease is the:

Most common cause

in older adults.

Spondylolisthesis

Anterior translation of one vertebra relative to another may further decrease the dimensions of the:

Spinal canal

and

Neural foramina.

Diagnosis

Diagnosis is based on the combination of:

Characteristic symptoms

Physical examination

and

Imaging evidence of neural compression.

Imaging abnormalities alone do not establish symptomatic stenosis because degenerative narrowing is common in:

Asymptomatic older adults.

History

Symptoms generally begin:

Insidiously

and progress:

Slowly.

Back Pain

Patients may initially report longstanding:

Low-back pain

followed by progressive:

Buttock

Thigh

or

Lower-extremity symptoms.

Neurogenic Claudication

The characteristic syndrome is:

Neurogenic claudication.

Symptoms include:

Pain

Tightness

Numbness

Paresthesia

and subjective:

Weakness or heaviness of the legs.

Provoking Factors

Symptoms typically worsen with:

Standing

Walking

and

Lumbar extension.

Relieving Factors

Symptoms usually improve with:

Sitting

Lumbar flexion

or

Leaning forward.

Flexion increases the dimensions of the:

Lumbar spinal canal

and reduces neural compression.

Shopping-Cart Sign

Patients commonly report that they can walk farther while:

Leaning forward over a shopping cart.

This characteristic improvement with flexion is sometimes called the:

Shopping-cart sign.

Walking on an Incline

The historical description that symptoms worsen when walking:

Uphill

is not typical of classic lumbar stenosis because uphill walking generally places the lumbar spine into more:

Flexion.

Many patients instead tolerate uphill walking or cycling better than:

Level or downhill walking.

Cycling

Patients may tolerate a:

Stationary bicycle

relatively well because the flexed posture increases:

Spinal canal dimensions.

Physical Examination

The neurologic examination may be relatively:

Normal at rest

despite substantial symptoms during:

Walking.

Gait

Evaluate:

Walking pattern

Balance

and ability to:

Heel walk

and

Toe walk.

Abnormal Gait

Gait disturbance should also prompt consideration of:

Cervical myelopathy

Thoracic spinal disease

Hip pathology

or

Neurologic disease.

Lumbar Lordosis

Some patients demonstrate reduced:

Lumbar lordosis

because a flexed posture may lessen:

Symptoms.

Range of Motion

Lumbar range of motion may be:

Reduced.

Extension often aggravates:

Leg symptoms.

Motor Examination

Assess the major muscle groups supplied by:

L2 through S1 nerve roots.

Weakness may occur, with:

L5 involvement

being common.

L5 Weakness

Possible findings include weakness of:

Great-toe extension

Ankle dorsiflexion

or

Hip abduction.

Sensory Examination

Assess dermatomal sensation throughout the:

Lower extremities.

Deficits may correspond to the nerve roots affected by:

Central

Lateral recess

or

Foraminal stenosis.

Reflexes

Evaluate:

Patellar reflexes

and

Achilles reflexes.

Reduced reflexes may indicate:

Nerve-root dysfunction.

Straight-Leg Raise

The straight-leg-raise test may be:

Negative

in isolated spinal stenosis.

It may become positive when there is associated:

Disc herniation

or focal:

Nerve-root irritation.

Cauda Equina Examination

Patients with new:

Urinary retention

Incontinence

Saddle anesthesia

Bilateral severe weakness

or rapidly progressive neurologic deficits require urgent evaluation for:

Cauda equina syndrome.

Rectal Examination

A rectal examination may be considered in selected patients when evaluating suspected:

Cauda equina syndrome

although modern assessment relies on the overall neurologic picture, including:

Perineal sensation

and

Bladder function.

Laboratory Tests

Routine laboratory testing is generally:

Not required

for uncomplicated degenerative stenosis.

Infection or Malignancy Evaluation

When infection, inflammatory disease, or malignancy is suspected, laboratory studies may include:

Complete blood count

C-reactive protein

and

ESR.

Imaging

Plain Radiographs

AP and lateral lumbar radiographs may demonstrate:

Disc-space narrowing

Facet arthrosis

Osteophytes

Degenerative scoliosis

and

Spondylolisthesis.

Role of Radiographs

Radiographs are also useful for identifying or excluding:

Fracture

Gross deformity

and certain destructive:

Bone lesions.

They do not directly demonstrate:

Neural compression.

Flexion-Extension Views

Dynamic flexion-extension radiographs may be obtained when there is concern for:

Segmental instability.

They are particularly useful in patients with:

Spondylolisthesis.

MRI

MRI is the preferred advanced imaging examination for most patients with suspected:

Lumbar spinal stenosis.

MRI Findings

MRI can demonstrate:

Central canal stenosis

Lateral recess narrowing

Foraminal stenosis

Disc bulging or herniation

Facet hypertrophy

and

Ligamentum flavum thickening.

Clinical Correlation

The level and severity of compression on MRI should correspond reasonably with:

The patient’s symptoms and examination.

Severe-appearing radiographic stenosis can exist without:

Clinical symptoms.

CT Myelography

CT myelography can provide excellent visualization of:

Thecal sac and nerve-root compression.

Indications for CT Myelography

It may be useful when:

MRI is contraindicated

MRI quality is limited by metal instrumentation

or detailed evaluation of:

Bony stenosis

is needed.

Limitations

CT myelography is:

Invasive

because it requires intrathecal:

Contrast injection.

Possible adverse effects include:

Post-lumbar-puncture headache

and rare contrast or procedural complications.

Diagnostic Injections

Selective nerve-root blocks or epidural injections may sometimes help identify the principal:

Symptomatic level

when imaging demonstrates multiple possible sites of:

Neural compression.

Pathological Findings

Characteristic anatomical abnormalities include:

Loss of disc height

Annular bulging

Facet hypertrophy

Ligamentum flavum thickening

Central canal narrowing

Lateral recess stenosis

Foraminal narrowing

and sometimes:

Segmental instability.

Differential Diagnosis

The most important differential diagnosis is:

Vascular claudication.

Other considerations include stenosis elsewhere in the:

Cervical

or

Thoracic spine.

Vascular Claudication

Vascular claudication is caused by inadequate:

Arterial blood flow

to the lower extremities.

Distinguishing Features

Vascular symptoms typically correlate with:

Walking distance

and improve when the patient:

Stops walking

regardless of spinal posture.

In contrast, neurogenic claudication is strongly influenced by:

Lumbar position.

Leaning Forward

Improvement with:

Forward flexion

strongly favors:

Neurogenic claudication.

Pulse Examination

Patients with suspected vascular disease should undergo assessment of:

Peripheral pulses

and, when indicated,

Vascular studies.

Cervical or Thoracic Stenosis

Abnormal balance, upper-motor-neuron findings, or upper-extremity symptoms should raise concern for:

Cervical or thoracic cord compression

rather than isolated:

Lumbar stenosis.

Treatment

General Measures

Initial management is generally:

Nonoperative

unless there is severe or rapidly progressive:

Neurologic compromise.

Weight Management

Weight reduction may decrease mechanical load on the:

Lumbar spine

and improve general:

Mobility and conditioning.

Bracing

A lumbar brace or corset may occasionally provide:

Short-term symptomatic relief.

Long-term routine bracing is generally discouraged because prolonged dependence may contribute to:

Trunk muscle deconditioning.

Activity

Patients should remain:

As active as tolerated

provided there is no:

Unstable fracture

Gross instability

or other contraindication.

Prolonged bed rest is generally:

Avoided.

Physical Therapy

Physical therapy aims to improve:

Conditioning

Strength

Walking tolerance

and

Functional mobility.

Aerobic Conditioning

A:

Stationary bicycle

is often well tolerated because it places the lumbar spine in:

Flexion.

Aquatic Therapy

Aquatic exercise can improve conditioning while reducing:

Weight-bearing stress.

Trunk Strengthening

Therapy may include:

Abdominal strengthening

Hip and lower-extremity conditioning

and appropriate:

Lumbar stabilization exercises.

Back Extensor Strengthening

Back-extensor strengthening may be useful as part of general conditioning, but exercises that repeatedly provoke extension-related:

Claudication symptoms

should be modified.

Gait Training

Gait training may improve:

Balance

Walking efficiency

and appropriate use of:

Assistive devices.

Medication

First-Line Medication

Pain control may include:

NSAIDs

when not contraindicated

and

Acetaminophen.

NSAIDs

NSAIDs may help reduce:

Mechanical back pain

and associated inflammatory symptoms.

Their use should take into account:

Gastrointestinal

Renal

and

Cardiovascular risk.

Aspirin

Enteric-coated aspirin was historically used as an anti-inflammatory agent, although modern practice more commonly uses other:

NSAIDs

when appropriate.

Opioids

There is generally no role for sustained long-term:

Opioid therapy

for chronic lumbar spinal stenosis.

Epidural Steroid Injection

Lumbar epidural corticosteroid injections may provide:

Temporary symptom relief

in selected patients.

They do not reverse the underlying:

Structural stenosis.

Role of Injection

Injections may be useful to:

Reduce radicular symptoms

facilitate participation in:

Rehabilitation

or sometimes clarify the symptomatic:

Spinal level.

Surgery

Surgery is considered when symptoms remain:

Functionally intolerable

despite adequate nonoperative treatment.

Surgical Indications

Typical indications include:

Severe neurogenic claudication

Persistent radicular pain

Progressive neurologic deficit

and major reduction in:

Quality of life.

Urgent Surgery

Urgent or emergency assessment is required for:

Cauda equina syndrome

or rapidly progressive:

Motor weakness.

Preoperative Assessment

Because many patients are older and have medical comorbidities, preoperative evaluation may involve:

Primary care

Internal medicine

Cardiology

or

Anesthesiology.

Decompression

The principal surgical goal is:

Adequate decompression of neural elements.

Laminectomy

A:

Laminectomy

is commonly used to enlarge the central:

Spinal canal.

Foraminotomy

A:

Foraminotomy

may be added when compression involves the:

Neural foramen.

Lateral Recess Decompression

Hypertrophic facets and ligament may be removed to decompress:

Traversing nerve roots

within the:

Lateral recess.

Discectomy

A discectomy may be performed when a significant:

Disc herniation

contributes to neural compression.

Fusion

Fusion is not required for every patient undergoing:

Lumbar decompression.

Indications for Fusion

Fusion may be considered when there is:

Pre-existing instability

Symptomatic spondylolisthesis

Major deformity

or when decompression itself is expected to create:

Iatrogenic instability.

Facet Resection

Extensive removal of the:

Facet joints

or disruption of stabilizing posterior structures increases the likelihood that:

Fusion

will be required.

Historically, removal of more than approximately:

50% of the facets

has been considered a potential threshold for concern regarding instability.

Instrumentation

When fusion is indicated, fixation is commonly obtained using:

Pedicle screws

with or without:

Interbody support.

Follow-Up

Follow-up is individualized according to whether treatment is:

Nonoperative

or

Surgical.

Historical Postoperative Schedule

Traditional postoperative visits may occur at approximately:

6 weeks

3 months

6 months

1 year

and

2 years

with longer-term review as needed.

Prognosis

The natural history is:

Variable.

Some patients remain relatively stable for prolonged periods, while others experience:

Gradual worsening.

Spinal stenosis does not invariably progress to severe:

Disability.

Nonoperative Prognosis

Many patients can maintain acceptable function using:

Exercise

Activity modification

Medication

and occasional:

Injections.

Surgical Prognosis

In appropriately selected patients whose symptoms persist despite conservative treatment, decompressive surgery generally improves:

Leg pain

Walking tolerance

and

Neurogenic claudication.

Relief of:

Leg symptoms

is generally more predictable than relief of isolated:

Low-back pain.

Complications

Cauda Equina Syndrome

Severe central stenosis may rarely cause:

Bladder dysfunction

Bowel dysfunction

Saddle anesthesia

and

Bilateral lower-extremity weakness.

This requires:

Urgent evaluation and decompression.

Surgical Infection

Spinal surgery carries a risk of:

Superficial

or

Deep infection.

Neurologic Injury

Decompression and instrumentation may rarely cause:

Nerve-root

or

Dural injury

and, depending on level, other neurologic complications.

Dural Tear

Incidental:

Durotomy

may occur during decompression, particularly in:

Revision surgery

or severe stenosis.

Pseudarthrosis

When fusion is performed, failure to achieve solid union may result in:

Pseudarthrosis.

This can cause:

Persistent pain

Implant failure

or need for:

Revision surgery.

Recurrent or Adjacent-Level Stenosis

Degenerative disease may progress at:

The operated level

or

Adjacent spinal levels.

This can lead to recurrent:

Neural compression.

Persistent Pain

Some patients continue to experience:

Back or leg pain

despite technically adequate surgery.

Patient Monitoring

Patients should be monitored for:

Walking tolerance

Leg pain

Neurologic deficits

Bladder or bowel symptoms

and overall:

Functional status.

Fusion Monitoring

When arthrodesis has been performed, imaging may be used to evaluate:

Alignment

Instrumentation

and progression toward:

Fusion.

Red-Flag Monitoring

Patients should seek urgent evaluation for development of:

New urinary retention

Loss of bowel control

Saddle anesthesia

Rapidly progressive leg weakness

or severe bilateral:

Neurologic symptoms.

Key Principle

Lumbar spinal stenosis is narrowing of the spinal canal, lateral recesses, or neural foramina that compresses the cauda equina or nerve roots, most commonly because of age-related disc, facet, and ligamentum flavum degeneration.

The hallmark clinical syndrome is:

Neurogenic claudication, characterized by leg pain, numbness, heaviness, or weakness that worsens with standing and walking and improves with sitting or forward flexion.

MRI is the principal imaging study used to define:

Neural compression, while radiographs help identify spondylolisthesis, deformity, and instability.

Initial management usually consists of:

Activity modification, conditioning and physical therapy, analgesic or anti-inflammatory treatment, weight management, and selective epidural injections.

Surgery is reserved for:

Persistent function-limiting symptoms, progressive neurologic deficit, or cauda equina syndrome, with decompression as the primary procedure and fusion added only when instability or deformity requires it.

Orthopaedic Surgery - Spina Bifida

Basics

Spina bifida is a congenital condition caused by:

Incomplete closure of the posterior elements of the spine.

It is present at birth but may not be recognized until:

Later in life.

The defect may occur at:

Any spinal level

or at multiple levels, although it most commonly affects the:

Caudal spine.

When associated with a neurologic deficit, spina bifida may lead to secondary problems involving the:

Genitourinary system

and

Lower extremities.

Spina Bifida Occulta

Spina bifida occulta is a small, skin-covered defect involving the posterior arch, most often at:

L5

or

S1.

It is generally a:

Benign incidental finding

without neurologic consequences.

Patients may have a slightly increased risk of:

Spondylolisthesis.

Myelomeningocele

Myelomeningocele consists of:

Multiple absent laminae

with exposed:

Meninges

and usually abnormal neural tissue.

A neurologic deficit is commonly present at the level of the defect.

Patients have a high risk of:

Hydrocephalus

and associated:

Chiari malformation.

Lipomeningocele

A lipomeningocele is a:

Fat-containing mass

arising from the caudal spinal canal and palpable beneath the skin.

It is associated with:

Neurologic dysfunction

but generally carries no substantial risk of:

Hydrocephalus.

Motor-Level Classification

All patients with spina bifida should be classified according to their:

Motor level.

The motor level is defined as the lowest spinal level with:

Antigravity muscle strength.

The motor level should be recorded separately for:

Each limb.

Synonyms

Other terms include:

Spinal dysraphism

Neural tube defect

and

Myelomeningocele.

Prevention

Periconceptional folate supplementation may reduce the risk of:

Neural tube defects.

A commonly recommended dose is:

0.4 mg of folic acid daily

during the early months of pregnancy, particularly before conception and during the first trimester.

Epidemiology

Spina bifida affects:

Males and females equally.

Incidence

Spina bifida occulta is found in approximately:

2–3% of the general population.

The overall incidence of neural tube defects in the United States is approximately:

1 per 1,000 births.

Rates vary considerably among:

Countries and geographic regions.

The risk is increased when a:

First-degree relative

has been affected.

Prevalence

The prevalence is reported to be:

Slightly higher in White populations

and

Lower in African American populations

than in the general population.

The frequency varies substantially between:

Different countries.

Risk Factors

Recognized risk factors include:

An affected first-degree relative

and

Poor maternal or perinatal nutrition.

Genetics

Spina bifida is not inherited in a simple:

Mendelian pattern.

It is thought to follow a:

Polygenic and multifactorial pattern.

No single causative genetic abnormality has been identified in most cases.

Etiology

The underlying mechanism is failure of:

Neural tube closure

or later:

Rupture of the neural tube.

The precise cause of this failure remains:

Unknown.

Associated Conditions

Spina bifida may be associated with:

Hydrocephalus

Chiari malformation

Syringomyelia

Kyphosis

Scoliosis

Renal dysfunction

Latex allergy

Sprengel deformity

and increased risk of:

Pathologic fracture.

Diagnosis

Diagnosis is based on:

Physical examination

Neurologic assessment

and appropriate:

Prenatal or postnatal imaging.

Signs and Symptoms

Local findings depend on the type of defect.

The skin overlying the lesion may show:

A small dimple

Hair growth

Vascular markings

or other abnormal pigmentation.

Lipomeningocele

A lipomeningocele may appear as a:

Subcutaneous fatty mass.

Myelomeningocele

A myelomeningocele may present with:

Exposed meninges

and neural tissue at birth.

Spina Bifida Occulta

Spina bifida occulta usually has:

No visible physical abnormality.

Neurologic Findings

General neurologic findings may include:

Motor weakness

Calf or thigh atrophy

and a corresponding:

Sensory deficit.

Bladder Dysfunction

A:

Neurogenic bladder

is common in patients with clinically significant spina bifida.

This may lead to:

Recurrent urinary tract infections

Urinary incontinence

or progressive:

Renal damage.

Symptoms

Spina bifida itself is often:

Asymptomatic.

Back pain is not usually caused directly by the bony defect.

However, patients may develop pain or neurologic deterioration from associated:

Tethered cord

or

Spondylolisthesis.

Physical Examination

The examination should include assessment of:

Spinal alignment

Skin coverage

Motor function

Sensation

Joint motion

Contractures

Gait

and signs of associated:

Hydrocephalus or Chiari malformation.

Spinal Deformity

Evaluate for:

Scoliosis

and

Kyphosis.

These deformities may progress during growth and can interfere with:

Sitting balance

or

Mobility.

Skin Examination

The quality of the skin covering the defect is important because poor skin coverage increases the risk of later:

Skin breakdown

and

Ulceration.

Motor Examination

Record the strength of the major muscle groups.

The motor level is the lowest level demonstrating:

Contraction against resistance.

This baseline should be documented for future comparison.

Sensory Examination

Record the lowest level of preserved sensation.

The sensory level helps predict the risk of:

Pressure sores

in areas of insensate skin.

Joint Examination

Assess each joint for:

Contractures

Dislocations

Deformities

and limitations in:

Range of motion.

Gait

If the patient is ambulatory, observe:

Gait pattern

Balance

Bracing requirements

and the efficiency of:

Walking.

Hydrocephalus and Chiari Malformation

Look for clinical signs of:

Hydrocephalus

or

Chiari malformation.

These may include:

Head enlargement

Headache

Vomiting

Abnormal eye movements

Swallowing difficulty

or other:

Brainstem symptoms.

Laboratory and Prenatal Testing

For pregnancies at increased risk, prenatal evaluation may include:

Amniocentesis

with measurement of:

Alpha-fetoprotein

and

Acetylcholinesterase.

Prenatal Ultrasound

Prenatal ultrasonography can detect many neural tube defects and may identify associated:

Cranial

Spinal

and

Limb abnormalities.

Imaging

Plain Radiographs

Baseline spinal radiographs are often obtained early in infancy to identify associated congenital abnormalities such as:

Hemivertebrae

and

Congenital vertebral fusion.

These abnormalities may occur in up to:

20% of children with true spina bifida.

Pelvic Radiographs

A baseline:

Anteroposterior pelvis radiograph

may be obtained to evaluate:

Hip development

and identify associated:

Subluxation or dislocation.

MRI

MRI of the:

Neuraxis

is obtained when needed to evaluate for:

Syringomyelia

Chiari malformation

Tethered spinal cord

or other spinal cord abnormalities.

Pathological Findings

A typical myelomeningocele may contain a:

Flattened spinal cord

with:

Scarring

and

Abnormally developed neural tissue.

Hydrocephalus and Chiari Malformation

Associated findings may include:

Hydrocephalus

and

Chiari malformation

with herniation of the:

Cerebellar tonsils

through the:

Foramen magnum.

Differential Diagnosis

The differential diagnosis includes:

A defect from previous laminectomy

and

Delayed ossification of an otherwise intact posterior arch.

Treatment

Management should be:

Multidisciplinary

and individualized according to:

Motor level

Sensory function

Spinal deformity

Bladder function

Ambulatory potential

and associated:

Neurologic abnormalities.

General Measures

An experienced:

Neurologist

Neurosurgeon

Orthopaedic surgeon

and

Urologist

should evaluate the child early, ideally:

At birth.

Latex Avoidance

Patients with spina bifida should avoid:

Latex exposure

because latex allergy is common and may become severe.

Genetic Counseling

Families should be offered:

Genetic counseling

regarding recurrence risk and preventive:

Folate supplementation.

Urinary Tract Infection Prevention

Patients with recurrent urinary tract infections may require:

Long-term, low-dose prophylactic antibiotics

under the supervision of a:

Urologist.

Bladder management should be individualized and may include:

Clean intermittent catheterization.

Neurologic Monitoring

Motor strength and sensory levels should be documented throughout life to detect:

Tethered cord

or other progressive neurologic complications.

Foot Deformities

Clubfoot should initially be treated with:

Serial casting

using a method such as:

Ponseti treatment.

Other Deformities

Additional deformities may be managed with:

Stretching

Bracing

or

Surgery

depending on severity and functional impact.

Skin Protection

Families and patients should be taught to protect areas of:

Insensate skin

from:

Pressure

Heat

Friction

and

Trauma.

Daily skin inspection is important.

Support Services

Families should be connected with appropriate support organizations, such as:

The Spina Bifida Association

and other community-based resources.

Hip Subluxation

Most cases of hip subluxation do not require surgery, particularly when the condition is:

High

Bilateral

and present in a:

Nonambulatory patient.

Treatment should focus on:

Comfort

Positioning

and

Function.

Activity

Patients should be encouraged to maximize activity using the most efficient and safe method, including:

Wheelchair mobility

or

Walking with braces.

Adaptive Sports

Wheelchair sports and other adaptive activities should be offered to interested patients.

These activities can improve:

Physical fitness

Social development

and

Self-image.

Physical Therapy

Patients should receive ongoing physical therapy throughout growth to:

Maximize mobility

Monitor muscle strength

Maintain joint motion

and

Optimize the use of braces and wheelchairs.

Weight Management

A physical therapist and nutritionist may help prevent:

Excessive weight gain

which can impair:

Mobility

and increase the difficulty of transfers and self-care.

Surgery

Clubfoot Surgery

Casting is the initial treatment for clubfoot.

If residual deformity persists, surgery may be required to:

Lengthen contracted tendons

and

Realign the bones

to create a plantigrade foot that can rest:

Flat on the ground.

Other Lower-Extremity Surgery

Additional foot or leg procedures may be performed when necessary to improve:

Alignment

Brace tolerance

Standing

or

Walking.

Spine Surgery

Spinal surgery may be indicated for progressive:

Scoliosis

or

Kyphosis

that causes:

Unbalanced sitting

or significant functional impairment.

Treatment may involve:

Spinal correction and fusion

with implanted:

Growing rods

or other spinal instrumentation.

Fetal Surgery

Prenatal repair of the neural tube defect may reduce the later risk of:

Hydrocephalus

and possibly decrease the need for shunt placement.

However, fetal surgery increases the risk of:

Premature birth

and requires careful maternal-fetal evaluation.

Prognosis

With modern neonatal and multidisciplinary care, infant mortality is only:

Slightly higher than in the general population.

The prognosis is worse in patients with severe:

Spina bifida cystica

and extensive:

Central nervous system involvement.

Functional Independence

Some patients may not achieve long-term independence because of:

Neurologic impairment

Hydrocephalus

Cognitive complications

Bladder dysfunction

or severe:

Lower-extremity weakness.

Complications

Potential complications include:

Shunt failure

Tethered cord

Progressive weakness

Syringomyelia

Chiari-related symptoms

Pressure sores

Fractures

and

Renal failure.

Shunt Failure

Patients with hydrocephalus may develop:

Ventriculoperitoneal shunt failure.

This can cause:

Headache

Vomiting

Altered mental status

or new:

Neurologic deterioration.

Tethered Cord

The spinal cord may become tethered at the site of the original defect.

As the child grows, tethering may cause progressive:

Weakness

Sensory loss

Pain

or worsening:

Bladder dysfunction.

Fracture

The risk of fracture is increased in patients with a more severe:

Neurologic deficit.

Fractures may occur with minimal trauma because of:

Insensate limbs

Muscle imbalance

Osteopenia

and impaired protective responses.

Fracture Presentation

Signs of fracture may be subtle and include:

Low-grade fever

Swelling

Warmth

and little or no:

Pain.

Radiographs may show:

Exuberant callus formation.

Pressure Sores

Pressure sores may develop over:

The ischium

The foot

or

The greater trochanter.

They are especially likely in areas of:

Insensate skin.

Renal Failure

Poor bladder care and recurrent urinary tract infections may eventually lead to:

Renal impairment

or

Renal failure.

Patient Monitoring

Patients with myelomeningocele should generally be followed every:

6–12 months.

Follow-up is intended to:

Identify new problems

Monitor neurologic function

Assess spinal alignment

and

Check the fit of braces and equipment.

Neurologic Deterioration

New neurologic deficits may result from:

Shunt failure

Syringomyelia

Tethered cord

or

Chiari malformation.

Any new weakness, sensory change, pain, gait deterioration, or bladder dysfunction requires prompt evaluation.

Equipment Monitoring

Regular assessment should ensure that:

Wheelchairs

Braces

Standing devices

and other adaptive equipment remain properly fitted and functional.

Key Principle

Spina bifida is a congenital neural tube defect caused by incomplete closure of the posterior spinal elements. Its clinical severity ranges from asymptomatic spina bifida occulta to myelomeningocele with major neurologic, bladder, and lower-extremity dysfunction.

Patients should be classified by their:

Motor level

and monitored for:

Tethered cord

Hydrocephalus

Chiari malformation

Syringomyelia

Spinal deformity

Pressure sores

and

Renal complications.

Successful care requires coordinated management by:

Neurology

Neurosurgery

Orthopaedics

Urology

Physical therapy

and

Rehabilitation services.

The goals are to preserve:

Neurologic function

Skin integrity

Bladder and renal health

Mobility

and

Long-term independence.

Orthopaedic Surgery - Soft-Tissue Tumors

Basics

Soft-tissue tumors arise from the:

Nonepithelial tissues of the musculoskeletal system.

They may originate from:

Fibrous tissue

Skeletal muscle

Tendons

Synovium

Peripheral nerves

Adipose tissue

and other:

Mesenchymal structures.

Classification

Soft-tissue masses include:

Benign neoplasms

Malignant neoplasms

Reactive lesions

and

Normal anatomical variants.

Benign soft-tissue tumors are substantially more common than:

Soft-tissue sarcomas.

Diagnostic Challenge

Distinguishing a benign lesion from a malignant tumor can be:

Difficult.

Some sarcomas may initially appear:

Painless

Slow growing

and relatively innocuous.

Therefore, an indeterminate soft-tissue mass requires a:

Systematic diagnostic approach.

Musculoskeletal Tumor Society Staging

The Musculoskeletal Tumor Society system, commonly called the:

Enneking staging system

classifies both benign and malignant musculoskeletal tumors.

Benign Tumors

Benign tumors are classified as:

Stage 1 – Latent or inactive

Stage 2 – Active

Stage 3 – Aggressive

Stage 1 Benign Tumor

A Stage 1 lesion is generally:

Well contained

Slow growing

and may remain:

Asymptomatic.

Stage 2 Benign Tumor

A Stage 2 lesion demonstrates:

Active growth

but usually remains contained within its:

Anatomic compartment.

Stage 3 Benign Tumor

A Stage 3 lesion behaves:

Locally aggressively

and may extend beyond its:

Normal tissue boundaries.

Although histologically benign, it can cause substantial:

Local destruction.

Malignant Tumors – Enneking System

Malignant tumors are broadly divided into:

Stage I – Low-grade sarcoma

Stage II – High-grade sarcoma

Stage III – Metastatic sarcoma.

The system also considers whether the tumor remains:

Intracompartmental

or has extended:

Extracompartmentally.

AJCC Staging

The:

American Joint Committee on Cancer

also provides staging systems for soft-tissue sarcomas.

Staging incorporates factors such as:

Tumor size

Depth or anatomic site

Histologic grade

Regional nodal disease

and

Distant metastasis.

Older simplified descriptions classified tumors largely according to:

Size

Grade

and presence of:

Metastases.

Epidemiology

Soft-tissue tumors can occur at:

Any age.

The specific tumor types encountered vary substantially according to:

Age group.

Most Common Benign Tumor

The most common soft-tissue tumor overall is:

Lipoma.

Adult Soft-Tissue Sarcomas

In adults, common soft-tissue sarcoma types include:

Liposarcoma

and

Undifferentiated pleomorphic sarcoma.

Pediatric Soft-Tissue Sarcomas

In children and adolescents, important malignant soft-tissue tumors include:

Rhabdomyosarcoma

and

Synovial sarcoma.

Incidence

Soft-tissue masses are:

Common

whereas true soft-tissue sarcomas are:

Rare.

Historically, benign lesions have been estimated to outnumber malignant soft-tissue tumors by approximately:

100:1.

Clinical Importance

Despite the rarity of sarcoma, the clinician must approach an unexplained mass:

Systematically

because inappropriate excision or delayed diagnosis can compromise later:

Definitive treatment.

Sex

Soft-tissue sarcomas have historically been reported somewhat more frequently in:

Males.

Risk Factors

Most patients with soft-tissue sarcoma have:

No identifiable predisposing factor.

Important recognized associations include:

Certain inherited syndromes

Prior radiation

and selected:

Chemical exposures.

Genetics

Most soft-tissue tumors are:

Sporadic

and are not directly inherited.

Neurofibromatosis

An important inherited exception is:

Neurofibromatosis type 1

caused by pathogenic variants involving:

NF1.

Patients have an increased risk of:

Malignant peripheral nerve sheath tumor.

Characteristic Genetic Abnormalities

Some soft-tissue sarcomas are associated with characteristic:

Chromosomal translocations

that can assist diagnosis.

Clear Cell Sarcoma

Clear cell sarcoma is associated with:

t(12;22)

involving characteristic fusion genes.

Extraskeletal Myxoid Chondrosarcoma

Extraskeletal myxoid chondrosarcoma is classically associated with:

t(9;22).

Synovial Sarcoma

Synovial sarcoma is associated with:

t(X;18)

resulting in an:

SS18-SSX fusion.

Alveolar Rhabdomyosarcoma

Alveolar rhabdomyosarcoma commonly demonstrates:

t(2;13)

or related rearrangements involving:

PAX and FOXO1 genes.

Myxoid Liposarcoma

Myxoid liposarcoma is characteristically associated with:

t(12;16).

Alveolar Soft-Part Sarcoma

Alveolar soft-part sarcoma has a characteristic:

X;17 translocation

producing an:

ASPSCR1-TFE3 fusion.

Extraskeletal Ewing Sarcoma

Extraskeletal Ewing sarcoma commonly demonstrates:

t(11;22)

with an:

EWSR1-FLI1 fusion.

Etiology

For most soft-tissue tumors, the exact cause is:

Unknown.

Trauma

Trauma generally does not cause sarcoma.

However, muscle injury may lead to reactive lesions such as:

Myositis ossificans

which can mimic a neoplasm clinically or radiographically.

Chemical Exposure

Exposure to certain industrial chemicals has been associated with an increased risk of:

Soft-tissue sarcoma

in selected populations.

Diagnosis

Evaluation begins with:

History

Physical examination

and appropriate:

Imaging.

Signs and Symptoms

The usual presentation is a:

Soft-tissue mass.

It may be:

Painless

or

Painful.

Growth

The lesion may remain stable or may progressively:

Increase in size.

A progressively enlarging mass should raise concern for:

Malignancy.

Features Concerning for Sarcoma

Particularly concerning findings include:

Increasing size

Deep location

Large size

Fixation to surrounding tissues

and unexplained:

Pain.

Physical Examination

Document:

Size

Location

Depth

Mobility

and the relationship of the mass to surrounding:

Skin

Muscle

Bone

Nerves

and

Vessels.

Mobility

A freely mobile superficial mass is more often:

Benign

although mobility alone cannot reliably exclude:

Malignancy.

A fixed mass may suggest involvement of:

Deep fascia

Muscle

Bone

or other adjacent structures.

Regional Lymph Nodes

Examine the relevant:

Regional lymph-node basins

for:

Lymphadenopathy.

Most adult soft-tissue sarcomas spread primarily through the:

Bloodstream

rather than lymphatics, but certain histologic types have a greater propensity for:

Nodal metastasis.

Laboratory Tests

There are generally:

No specific routine laboratory tests

that diagnose a soft-tissue tumor.

Laboratory evaluation is guided by:

Clinical context

and suspected diagnosis.

Imaging

Plain Radiographs

Plain radiography is frequently the first imaging study.

Although most soft-tissue tumors are not diagnosed from radiographs alone, several findings can be highly informative.

Phleboliths

Calcified venous thrombi called:

Phleboliths

may be seen in:

Venous malformations or hemangioma-type vascular lesions.

They are highly suggestive when present.

Lipoma

Deep lipomas may occasionally appear as a relatively:

Radiolucent oval soft-tissue mass

because of their fat content.

Myositis Ossificans

Myositis ossificans typically develops a characteristic:

Zonal pattern of mineralization.

The lesion becomes more heavily ossified at the:

Periphery

while remaining relatively lucent toward the:

Center.

This pattern helps distinguish it from some malignant lesions.

Synovial Sarcoma

Approximately:

20–30%

of synovial sarcomas may contain:

Scattered calcifications.

Ultrasound

Ultrasound can help distinguish a:

Cystic

from a:

Solid lesion.

It can also evaluate:

Vascularity

and guide:

Aspiration or biopsy.

MRI

MRI is the principal imaging modality for characterization of most:

Soft-tissue masses.

It provides excellent definition of:

Tumor size

Depth

Anatomic compartment

Relationship to fascia

Neurovascular structures

and surrounding:

Muscle and bone.

Determinate Mass

A mass is considered:

Determinate

when imaging features are sufficiently characteristic to establish a confident diagnosis.

Examples include some:

Simple lipomas

and

Ganglion cysts.

Indeterminate Mass

A mass is considered:

Indeterminate

when imaging cannot establish a specific diagnosis with adequate certainty.

Sarcomas and MRI

Soft-tissue sarcomas generally appear as:

Indeterminate masses.

However, many benign tumors can also be:

Indeterminate.

Therefore, an indeterminate lesion should not automatically be assumed to be:

Malignant

or

Benign.

MRI Features Suggesting Aggressive Disease

Features that may increase concern include:

Large size

Deep fascial location

Heterogeneous signal

Necrosis

Peritumoral edema

and invasion of:

Adjacent structures.

None of these findings alone is completely diagnostic.

Biopsy

An indeterminate soft-tissue mass that cannot be confidently characterized may require:

Biopsy.

Biopsy Planning

Biopsy should ideally be planned by the:

Orthopaedic oncology or sarcoma team

that would perform definitive treatment.

The biopsy tract should be positioned so that it can later be:

Completely excised

during tumor resection.

Core Needle Biopsy

Image-guided:

Core needle biopsy

is commonly preferred because it provides tissue architecture while minimizing:

Contamination of surrounding tissues.

Pathological Findings

Histologic evaluation of soft-tissue tumors can be:

Challenging.

Specialist Pathology

Interpretation is best performed by a pathologist experienced in:

Musculoskeletal and soft-tissue tumors.

Incorrect classification or grading can alter:

Treatment

and

Prognosis.

Molecular Testing

Selected tumors may require:

Immunohistochemistry

Cytogenetics

or

Molecular testing

to confirm the diagnosis.

Differential Diagnosis

The differential includes tumors arising primarily from:

Bone

with extension into the:

Soft tissues.

Intramedullary Bone Tumor

A primary intramedullary bone tumor may break through the:

Cortex

and create a large:

Soft-tissue component.

Surface Bone Tumor

A tumor arising from the surface of bone may also present clinically as a:

Soft-tissue mass.

Imaging should therefore establish whether the lesion originates from:

Soft tissue

or

Bone.

Treatment

Treatment depends on whether the lesion is:

Benign

Malignant

or

Reactive.

Observation

Observation is appropriate for selected:

Asymptomatic benign lesions

when the diagnosis is confidently established.

Examples include some:

Lipomas

and

Ganglion cysts.

Requirement for Observation

Observation should only be chosen when the clinician is sufficiently certain:

What the lesion is.

An unidentified mass should not simply be labeled:

“Probably benign.”

Indeterminate Lesions

If the diagnosis remains uncertain, further:

Imaging

or

Biopsy

is generally appropriate before definitive treatment.

Activity

Routine activity restriction is usually unnecessary solely because a patient has a:

Soft-tissue tumor.

Unlike many bone tumors, there is generally no direct risk of:

Pathological fracture

from the soft-tissue mass itself.

Restrictions may still be appropriate if the lesion causes:

Pain

Neurologic compromise

or other functional limitations.

Physical Therapy

Physical therapy is often useful:

Postoperatively

to restore:

Range of motion

Strength

and

Function.

Medication

Chemotherapy

Cytotoxic chemotherapy is used for selected:

Soft-tissue sarcomas.

Its role depends strongly on:

Histologic subtype

Stage

Age

and overall:

Patient fitness.

Chemosensitive Tumors

Sarcomas such as:

Rhabdomyosarcoma

and

Ewing sarcoma

are substantially more chemotherapy-sensitive than many common adult:

Soft-tissue sarcomas.

Surgery

Surgery is the cornerstone of local treatment for many soft-tissue tumors.

The required margin depends on:

Biologic behavior

and

Malignancy grade.

Benign Tumors

Benign lesions may be removed with:

Intralesional

or

Marginal excision

depending on the tumor type and recurrence risk.

Malignant Tumors

Soft-tissue sarcomas generally require:

Wide excision

with a cuff of:

Normal tissue

around the tumor.

The goal is an:

Microscopically negative margin.

Radical Excision

A radical margin removes the entire:

Anatomic compartment

containing the tumor.

This is now less commonly required because modern treatment often combines:

Limb-sparing surgery

with

Radiation therapy.

Limb-Sparing Surgery

The great majority of extremity sarcomas can now be treated with:

Limb-sparing surgery.

Historical series report rates approaching:

95%.

Requirements for Limb Salvage

Successful limb salvage requires:

Complete tumor removal with negative margins

A functional extremity after reconstruction

and

Acceptable wound healing

so that additional treatment such as:

Radiation

or

Chemotherapy

is not compromised.

Major Nerve or Vessel Involvement

Extensive involvement of:

Major nerves

or

Major blood vessels

may make limb salvage difficult.

In selected cases, vascular reconstruction or nerve sacrifice may still permit limb preservation, while other cases may require:

Amputation.

Radiation Therapy

Radiation therapy is frequently combined with surgery for:

Intermediate- or high-grade soft-tissue sarcomas

to reduce the risk of:

Local recurrence.

Preoperative Radiation

Radiation given before surgery generally treats a:

Smaller field

and may reduce certain long-term tissue effects, but it is associated with a higher risk of:

Early wound complications.

Postoperative Radiation

Postoperative radiation may reduce the risk of:

Wound-healing problems

relative to preoperative treatment but usually requires a larger field and may produce greater long-term:

Fibrosis

Edema

and

Joint stiffness.

Prognosis

Prognosis depends primarily on:

Histologic grade

Tumor size

Depth

Anatomic site

Margin status

and presence of:

Metastatic disease.

Local Recurrence

With appropriate multidisciplinary treatment, local recurrence should generally be:

Uncommon.

Historical rates are approximately:

5–10%.

Pulmonary Metastases

The lungs are the most common site of distant spread for many:

Extremity soft-tissue sarcomas.

In selected high-risk tumors, the risk of pulmonary metastasis may approach:

50%.

High-Risk Tumors

Large:

High-grade

and

Deep tumors

have the greatest risk of:

Metastatic spread.

Tumor Size

Increasing tumor size is associated with a progressively worse:

Prognosis.

Older staging descriptions often emphasized size categories such as:

5–10 cm

10–15 cm

and

Greater than 15 cm.

Complications

Wound Complications

When surgery and radiation are combined, complications such as:

Infection

and

Wound breakdown

may occur.

Historical rates have ranged from approximately:

10–30%.

Local Recurrence

Local recurrence occurs in approximately:

5–10%

of appropriately treated patients, although risk varies according to:

Tumor biology

Margin status

and treatment.

Diagnostic Error

Incorrect histologic diagnosis is an important potential complication because:

Soft-tissue pathology is complex.

Expert pathological review is particularly valuable when the diagnosis is:

Unusual

or treatment would be substantially altered by subtype.

Functional Complications

Treatment may also result in:

Muscle weakness

Joint stiffness

Lymphedema

Nerve deficits

and limitations in:

Limb function.

Patient Monitoring

Surveillance is directed toward detecting:

Local recurrence

and

Distant metastasis.

Local Surveillance

MRI with contrast is often used to evaluate the:

Surgical bed

when local imaging is required.

Historical Surveillance Schedule

Older protocols commonly obtained local MRI approximately:

Every 3 months for the first 2 years

then:

Every 6 months for another year

followed by:

Annual imaging through approximately 5 years.

Modern schedules are individualized according to:

Tumor grade

Size

Histology

and

Recurrence risk.

Pulmonary Surveillance

Because the lungs are the most common metastatic site, follow-up usually includes:

Chest imaging.

Historical Chest Surveillance

Older protocols often used:

Chest CT every 3 months for approximately 3 years

followed by less frequent:

Chest CT or radiography

for prolonged surveillance.

Modern follow-up intervals are tailored according to:

Sarcoma subtype

Stage

and institutional protocols.

Long-Term Follow-Up

Some sarcomas can recur or metastasize:

Years after initial treatment.

Long-term surveillance may therefore be appropriate, particularly for:

Higher-risk histologies.

Key Principle

Soft-tissue tumors arise from mesenchymal tissues such as fat, muscle, fibrous tissue, tendons, synovium, and peripheral nerves and may be:

Benign, malignant, reactive, or normal variants.

Benign tumors greatly outnumber:

Soft-tissue sarcomas, but an enlarging, deep, fixed, or otherwise indeterminate mass should never be assumed to be harmless.

MRI is the principal study for defining:

Tumor size, depth, compartment, and relationship to surrounding structures, but many sarcomas and benign tumors remain indeterminate on imaging and therefore require:

Properly planned biopsy.

Treatment of sarcoma is multidisciplinary and usually combines:

Wide surgical excision with negative margins, selective radiation therapy, and subtype-specific systemic treatment.

Careful biopsy planning, expert pathology, appropriate oncologic surgery, and long-term surveillance are essential for minimizing:

Local recurrence, metastatic spread, and avoidable loss of limb function.

Orthopaedic Surgery - Snapping Hip

Basics

Snapping hip, also called:

Coxa saltans

is a condition in which the patient feels or hears:

Snapping

Popping

or

Clicking

around the hip during movement.

Occasional painless snapping is common and often:

Clinically insignificant.

Patients generally seek treatment when the snapping becomes:

Frequent

Painful

or

Functionally limiting.

Synonyms

Common terms include:

Snapping hip

Popping hip

Coxa saltans

and, depending on the structure involved,

Tendinous snapping.

Classification

Snapping hip can be divided into:

Internal

External

and

Intra-articular

types.

The distinction is based on the structure producing the:

Snapping sensation.

Internal Snapping Hip

Internal snapping usually results from movement of the:

Iliopsoas tendon

over structures at the front of the hip.

Potential contact points include the:

Femoral head

Iliopectineal eminence

or

Superior pubic ramus.

External Snapping Hip

External snapping usually results from movement of the:

Iliotibial band

or anterior fibers of the:

Gluteus maximus

over the:

Greater trochanter.

Intra-Articular Snapping

Intra-articular causes include:

Acetabular labral tears

Loose bodies

Cartilage lesions

and other abnormalities within the:

Hip joint.

These may produce:

Clicking

Catching

or

Mechanical locking.

Prevention

Preventive measures include:

Adequate stretching before and after sports

and avoiding unnecessary repetitive activities that provoke:

Hip snapping.

Intramuscular Injections

Repeated intramuscular injections into the:

Gluteal region

may rarely lead to fibrosis and contracture of the:

Gluteal muscles

or

Iliotibial band.

Avoiding repeated injections into the same region may therefore reduce this uncommon risk.

Epidemiology

Snapping hip may occur at:

Any age

including in:

Older adults.

It is reported more often in:

Females

than in males.

Incidence

Clinically significant snapping hip is:

Uncommon.

Reliable population estimates of its true:

Incidence and prevalence

are not well established.

Risk Factors

Important risk factors include:

Coxa vara

Repetitive athletic activity

Rapid increases in training volume

and a history of repeated:

Gluteal intramuscular injections.

Coxa Vara

A decreased:

Femoral neck-shaft angle

makes the greater trochanter relatively more prominent.

This can increase friction between the:

Greater trochanter

and

Iliotibial band

and predispose to:

External snapping.

Athletic Activity

Athletes who dramatically increase their:

Training volume

or frequency of repetitive hip motion may develop symptomatic snapping because of:

Tendon irritation

and altered:

Muscle-tendon mechanics.

Genetics

There is no established:

Genetic predisposition

for snapping hip syndrome.

Etiology

The mechanism depends on whether the snapping is:

Internal

External

or

Intra-articular.

Internal Snapping

The iliopsoas tendon may move abruptly over the:

Anterior femoral head

Pelvic brim

or

Iliopectineal eminence

during hip motion.

This movement can produce an audible or palpable:

Snap.

Iliopsoas Mechanics

During hip:

Flexion and abduction

the iliopsoas tendon changes position relative to the pelvic brim.

As the hip moves toward:

Extension and adduction

the tendon may shift medially and snap over an underlying:

Bony prominence.

External Snapping

The iliotibial band or anterior fibers of the gluteus maximus may move from:

Posterior

to

Anterior

over the greater trochanter as the hip is:

Flexed and extended.

A tight or thickened tendon can produce a visible and palpable:

Snap.

Injection-Related Fibrosis

Repeated gluteal injections may cause:

Fibrosis

and

Contracture

of the gluteus maximus or iliotibial band.

This can accentuate abnormal movement over the:

Greater trochanter.

Intra-Articular Causes

Mechanical symptoms arising from inside the joint may result from:

Loose bodies

Labral tearing

Chondral injury

or other intra-articular abnormalities.

After Total Hip Arthroplasty

Rarely, snapping or painful mechanical symptoms may occur after:

Total hip arthroplasty.

Potential causes include:

Component malposition

Iliopsoas irritation

or

Implant loosening.

Associated Conditions

Most cases of snapping hip occur:

In isolation

and are not associated with a systemic disorder.

Diagnosis

The diagnosis depends on:

History

Localization of symptoms

Dynamic physical examination

and selective:

Imaging or diagnostic injection.

Signs and Symptoms

Patients commonly describe:

A tendon or muscle jumping

over the:

Front

or

Side of the hip.

Localization

The patient’s ability to point directly to the site of snapping is highly useful.

Snapping felt:

Anteriorly

suggests an:

Iliopsoas mechanism.

Snapping felt:

Laterally

suggests:

Iliotibial band or gluteus maximus involvement.

Functional Symptoms

Patients may have difficulty:

Entering or rising from a squat

or with activities requiring repeated:

Hip flexion and extension.

Reproducibility

The snapping can often be reproduced during:

Specific hip movements.

This is useful both diagnostically and for identifying the structure responsible.

History

Symptoms usually begin:

Gradually

and often without a discrete:

Traumatic event.

Athletic Association

Symptomatic snapping occurs more often in:

Athletes

than in the general population.

It commonly begins in:

Juvenile

or

Adolescent years.

Important History Questions

Ask:

What movement triggers the snapping?

Where is it felt?

How often does it occur?

Is it painful?

Is there catching or locking?

Was there any trauma?

Has there been prior hip surgery?

Physical Examination

Ask the patient to:

Point to the exact location of the snap

and, if possible,

Reproduce it.

Internal Versus External Location

An anterior snap favors:

Iliopsoas involvement.

A lateral snap over the greater trochanter favors:

Iliotibial band or gluteus maximus involvement.

Iliopsoas Provocation

A maneuver similar to a:

Figure-4 movement

may reproduce iliopsoas snapping.

The patient moves the hip from:

Extension

toward:

Flexion and abduction

and then back toward:

Extension and adduction.

Figure-4 Maneuver

The snapping may occur as the iliopsoas tendon shifts across the:

Pelvic brim

during the transition between these positions.

External Snapping Examination

To evaluate the iliotibial band, the patient may be placed:

Lying on the opposite side.

The affected hip is then repeatedly:

Flexed

and

Extended

with progressively greater:

Adduction.

Findings in External Snapping

Assess for:

Visible or palpable snapping

Reproduction of pain

and possible:

Abduction contracture.

Blocking the Tendon

The examiner may attempt to manually stabilize or block movement of the:

Iliopsoas tendon

or

Iliotibial band.

Reduction or elimination of the snap can help confirm the:

Responsible structure.

Imaging

Plain Radiographs

Plain radiographs of the pelvis and hip are useful primarily to exclude:

Bony abnormalities

or underlying joint pathology.

Bony Causes

Radiographs may identify:

Coxa vara

Exostosis

Hip dysplasia

Arthritis

or other structural abnormalities.

MRI

MRI may be useful when symptoms suggest:

Labral pathology

Bursal inflammation

Tendon abnormality

or another intra-articular condition.

MR Arthrography

MR arthrography may provide additional sensitivity for detecting:

Acetabular labral tears

in selected patients.

CT

CT may be useful when a structural bony abnormality is identified and more precise definition of:

Bone anatomy

is required.

Dynamic Ultrasound

Ultrasound is particularly useful because it can evaluate the hip:

Dynamically.

An experienced examiner may directly visualize:

Iliopsoas

or

Iliotibial band movement

during the snapping event.

Ultrasound-Guided Injection

Ultrasound can also guide diagnostic or therapeutic injection into the:

Iliopsoas bursa

or other symptomatic regions.

Iliopsoas Bursography

Historically, iliopsoas bursography has been performed under:

Fluoroscopy

with contrast injected into the:

Iliopsoas bursa.

The tendon may be seen to move abruptly during provocative hip motion.

Diagnostic Iliopsoas Injection

A combination of:

Local anesthetic

and sometimes:

Corticosteroid

may be injected around the iliopsoas tendon or bursa.

Marked temporary symptom relief supports the diagnosis of:

Internal snapping hip.

Trochanteric Injection

Injection around the:

Greater trochanteric bursa

may help confirm that lateral symptoms originate from the:

Peritrochanteric structures.

Hip Arthroscopy

Hip arthroscopy may be useful when an:

Intra-articular cause

is strongly suspected.

It can both confirm and treat:

Labral tears

Loose bodies

and selected:

Chondral lesions.

Pathological Findings

Internal Snapping

The iliopsoas unit travels across a relatively shallow region between the:

Iliopectineal eminence

and nearby anterior pelvic structures.

Snapping may occur as the tendon moves over:

Bone

Iliopsoas bursa

or neighboring tendon components.

External Snapping

The iliotibial band receives contributions from the:

Tensor fasciae latae

and

Gluteus maximus.

It remains under tension as the hip:

Flexes and extends

and moves over the:

Greater trochanter.

Trochanteric Bursa

Thickening or inflammation of the:

Trochanteric bursa

or increased tension within the iliotibial band may contribute to:

External snapping.

Differential Diagnosis

Important alternatives include:

Acetabular labral tear

Loose body

Hip subluxation

Exostosis

Greater trochanteric pain syndrome

Iliopsoas bursitis

and referred mechanical symptoms from the:

Knee.

Meniscal Snapping

A snapping meniscus may occasionally be mistaken for snapping hip because the:

Hip and knee often flex together

during movement.

Careful localization is therefore important.

Exostosis

A bony exostosis around the hip may mechanically interfere with:

Tendon excursion

and produce snapping.

Habitual Hip Subluxation

Habitual hip subluxation is an uncommon disorder in:

Children and adolescents

that may mimic snapping hip.

The sensation is generally deeper and associated with actual:

Joint translation.

Treatment

Treatment depends on:

Severity

Pain

and the underlying:

Cause.

Painless snapping generally requires:

No treatment.

General Measures

For symptomatic cases, initial treatment includes:

Activity modification

Stretching

Anti-inflammatory medication

and, when needed,

Diagnostic or therapeutic injection.

Activity Modification

Patients should temporarily reduce movements that repeatedly provoke symptoms, such as:

Running

Repeated hip flexion-extension

or

Adduction-based activities.

Incline Running

Running along the side of an incline may increase repetitive:

Adduction

and tension across the lateral hip.

Avoiding this activity may reduce:

External snapping.

Stretching

Stretching should target the involved structure.

For internal snapping, therapy may emphasize the:

Iliopsoas.

For external snapping, emphasis is placed on the:

Iliotibial band

and surrounding:

Hip musculature.

Injection Therapy

Injection may be used when conservative therapy alone is insufficient.

A mixture of:

Local anesthetic

and

Corticosteroid

may provide both:

Diagnostic confirmation

and

Symptomatic relief.

Repeat Injection

In selected persistent cases, corticosteroid injection may be repeated after an appropriate interval, historically around:

6 months

depending on response and clinical circumstances.

Physical Therapy

Physical therapy may focus on:

Iliopsoas stretching

Iliotibial band flexibility

Hip abductor strengthening

Core control

and correction of:

Movement patterns.

Medication

NSAIDs

NSAIDs may be used for:

Pain

and associated:

Inflammation.

Choice of agent and dosing should account for:

Age

Comorbidities

Renal function

and gastrointestinal:

Risk.

Gastrointestinal Risk

NSAIDs should be used cautiously in patients with a history of:

Peptic ulcer disease

or other significant:

Gastrointestinal disease.

Opioids

Opioid analgesics are generally:

Not indicated

for uncomplicated snapping hip.

Surgery

Surgery is reserved for:

Persistent, functionally limiting symptoms

that fail appropriate:

Nonoperative treatment.

External Snapping Surgery

When the iliotibial band is responsible, operative treatment may involve:

Lengthening

or

Release of the iliotibial band

over the:

Greater trochanter.

Iliopsoas Surgery

Persistent internal snapping may be treated by:

Iliopsoas tendon lengthening

or

Release.

This can be performed at different anatomical levels depending on the:

Specific technique.

Intra-Articular Surgery

Hip arthroscopy can treat:

Loose bodies

Labral tears

and other mechanical:

Intra-articular lesions.

Surgical Selection

Surgery should be used cautiously when no definite:

Structural cause

has been demonstrated because outcomes are less predictable.

Complications of Surgery

One possible complication after iliopsoas release or lengthening is:

Hip flexion weakness.

Rare neurologic complications, including:

Femoral nerve injury

may also occur.

Follow-Up

Because snapping hip is usually:

Benign

follow-up can often be:

As needed.

Patient Self-Monitoring

Patients may return for reassessment if symptoms become:

More painful

More frequent

or begin causing:

Functional limitation

Catching

or

Locking.

Prognosis

The prognosis is generally:

Good.

Most cases do not remain a major long-term problem.

Arthritis Risk

Isolated extra-articular snapping hip does not typically lead directly to:

Hip arthritis.

However, intra-articular pathology such as a labral tear may have its own long-term implications.

Complications

The most common difficulty is:

Persistent symptoms despite treatment.

Failed Conservative Treatment

Some patients continue to experience:

Snapping

or

Pain

despite stretching, activity modification, and injections.

These cases require reconsideration of the:

Diagnosis and underlying structure.

Key Principle

Snapping hip, or coxa saltans, describes a palpable or audible snap around the hip and may arise from:

Internal iliopsoas motion, external iliotibial-band or gluteus maximus motion, or intra-articular pathology such as a labral tear or loose body.

The diagnosis is usually made by:

Careful localization and reproduction of the snapping during physical examination, with dynamic ultrasound, MRI, or diagnostic injection used when necessary.

Most symptomatic cases improve with:

Activity modification, stretching, physical therapy, NSAIDs, and selective injection therapy.

Surgery is reserved for:

Persistent, functionally limiting cases with a clearly identified structural cause.

Orthopaedic Surgery - Slipped Capital Femoral Epiphysis

Basics

Slipped capital femoral epiphysis, or:

SCFE

is an adolescent hip disorder in which the:

Femoral head remains seated within the acetabulum

while the:

Femoral neck and metaphysis displace relative to the epiphysis through the proximal femoral physis.

Clinically, this produces:

External rotation of the lower extremity

and often a:

Limp.

Classification

SCFE can be classified according to:

Stability

Duration of symptoms

and

Degree of displacement.

Stable SCFE

A slip is considered:

Stable

when the patient can still bear some weight on the affected limb, with or without:

Crutches.

Stable slips have a substantially better prognosis.

Historical series report satisfactory results in approximately:

95% of appropriately treated stable cases.

Unstable SCFE

A slip is:

Unstable

when the patient is unable to bear weight, even with assistance.

This form carries a much higher risk of:

Avascular necrosis

and often represents a more severe:

Physeal injury.

Historical series have reported satisfactory outcomes in only about:

50% of unstable cases.

Chronologic Classification

SCFE may also be categorized by symptom duration.

Acute: symptoms present for less than approximately 3 weeks

Chronic: symptoms present for more than approximately 3 weeks

Some patients have an:

Acute-on-chronic presentation

with sudden worsening of longstanding symptoms.

Anatomic Severity

Displacement can be graded by the percentage of slip.

Grade 0 – Preslip: no visible displacement, but clinical or MRI evidence of impending physeal failure

Grade I – Mild: approximately 1–33% displacement

Grade II – Moderate: approximately 33–50% displacement

Grade III – Severe: more than 50% displacement

Epidemiology

SCFE occurs predominantly during the:

Adolescent growth spurt.

Approximately:

80% of cases

occur during adolescence.

Typical Age

The usual age range is approximately:

10–16 years in boys

and

9–14 years in girls.

Sex

Boys are affected more often than girls, historically at approximately a:

2.4:1 male-to-female ratio.

Incidence

The incidence in the general population has been reported at approximately:

2–10 cases per 100,000 persons per year.

Seasonal Variation

Historical studies have suggested seasonal variation, with higher incidence around:

September

and lower incidence around:

March.

Possible explanations have included:

Seasonal activity patterns

and potential effects of:

Vitamin D status, although the clinical significance remains uncertain.

Risk Factors

Important risk factors include:

Adolescence

Male sex

Obesity

Delayed skeletal maturation

and

Previous contralateral SCFE.

Obesity

Obesity is one of the strongest risk factors.

Approximately:

50–75% of patients

have historically had a BMI above the:

90th percentile.

Bilateral Disease

SCFE may affect both hips.

Approximately:

25%

have bilateral disease at initial presentation, and up to approximately:

50%

may eventually develop involvement of the:

Contralateral hip.

Race and Population Variation

Incidence differs among populations.

Historically, higher rates have been reported in:

Black adolescents

compared with some other groups.

Genetics

Familial clustering occurs more often than expected by chance.

Historical reports suggest SCFE in approximately:

5–7% of family members

of affected patients.

However, most cases do not follow a simple:

Mendelian inheritance pattern.

Etiology

SCFE is most likely:

Multifactorial.

The proximal femoral growth plate becomes susceptible when:

Physeal strength decreases

while

Shear forces increase.

Growth-Plate Vulnerability

During rapid growth, the proximal femoral physis becomes relatively:

Weaker

and more vulnerable to:

Shear stress.

Mechanical Stress

Increased mechanical stress may result from:

Obesity

Activity

Minor trauma

or altered:

Hip biomechanics.

Endocrine and Metabolic Causes

Less commonly, SCFE may be associated with disorders that weaken the:

Physis.

Examples include:

Hypothyroidism

Panhypopituitarism

Hypogonadism

Hyperparathyroidism

Renal osteodystrophy

and

Chronic renal failure.

Radiation

Previous:

Pelvic radiation therapy

may also weaken the proximal femoral physis and predispose to:

SCFE.

Associated Conditions

Important associated conditions include:

Hypothyroidism

Hyperparathyroidism

Chronic renal disease

Renal osteodystrophy

and

Previous pelvic irradiation.

Diagnosis

Diagnosis requires a high index of suspicion because symptoms are often:

Mild

Insidious

or referred away from the hip.

Signs and Symptoms

The most common symptom is:

Pain.

Pain Location

Pain may be located in the:

Groin

Medial thigh

or

Knee.

Referred Knee Pain

Some patients present almost entirely with:

Knee pain.

This is an important cause of delayed diagnosis.

A child or adolescent with unexplained knee pain should therefore have the:

Hip examined.

Limp

Common gait abnormalities include:

Antalgic gait

Trendelenburg gait

and

Externally rotated gait.

Antalgic Gait

The patient spends as little time as possible bearing weight on the:

Affected limb.

External Rotation

The affected lower extremity often rests in:

External rotation.

History

SCFE frequently develops without a major traumatic event.

The onset is often:

Spontaneous and gradual.

Trauma

Some patients report:

Minor trauma

but this is not required for diagnosis.

Delayed Presentation

Pain may be relatively mild, and patients may delay seeking medical attention.

Some report only:

Fatigue

Limping

or difficulty keeping up with peers.

Endocrine Symptoms

Features suggesting an associated endocrine disorder include:

Cold intolerance

Lethargy

Delayed skeletal maturity

Coarse hair

and abnormalities of:

Growth or puberty.

Physical Examination

Groin and Proximal Femur Tenderness

There may be mild tenderness over the:

Groin

or

Proximal femur.

Internal Rotation

Loss of:

Hip internal rotation

is one of the most characteristic examination findings.

Many patients have:

Little or no internal rotation.

Painful Motion

Pain is typically greatest with:

Internal rotation

and sometimes:

Abduction.

Obligatory External Rotation

A classic finding is:

Obligatory external rotation during hip flexion.

As the hip is flexed, the leg automatically rotates:

Externally.

This is sometimes called:

Drehmann sign.

Resting Position

The affected limb often rests in more:

External rotation

than the opposite side.

Endocrine Screening

History and examination should assess for evidence of:

Hypothyroidism

Pituitary disease

Hypogonadism

and

Renal osteodystrophy.

Laboratory Tests

Routine laboratory testing is not required in every patient.

Endocrine Evaluation

An endocrine workup is appropriate when there is:

Marked delay in skeletal maturity

Atypical age

Short stature

or symptoms suggesting:

Endocrine or metabolic disease.

Imaging

Plain Radiographs

Standard radiographs are usually sufficient to establish the diagnosis.

Typical views include:

AP pelvis

and

Lateral view of the affected hip.

Lateral View

The slip is often most apparent on the:

Lateral projection.

Frog-Leg Lateral

A frog-leg lateral may be useful in a:

Stable SCFE.

It should generally be avoided in an unstable slip because positioning may theoretically worsen:

Displacement.

A cross-table lateral can be used instead.

Radiographic Appearance

The epiphysis remains in the acetabulum while the metaphysis and femoral neck move:

Anteriorly and superiorly

relative to the head.

This produces the classic appearance of:

Ice cream slipping off its cone.

Kline Line

Kline line is drawn along the superior border of the:

Femoral neck.

Normally, this line should intersect part of the:

Femoral head epiphysis.

Loss or reduction of this intersection suggests:

SCFE.

Physeal Changes

Other radiographic findings include:

Widening of the physis

Physeal lucency

Physeal irregularity

and

Blurring of the growth plate.

Epiphyseal Height

There may be a relative decrease in:

Epiphyseal height

compared with the:

Contralateral hip.

Varus Relationship

The epiphysis may appear relatively:

Varus

with respect to the femoral neck.

Pistol-Grip Deformity

Chronic remodeling can produce a:

Pistol-grip deformity

from prominence of the:

Anterolateral femoral neck or metaphysis.

This can predispose to:

Femoroacetabular impingement.

MRI

MRI is useful when a:

Preslip

is suspected despite normal or equivocal radiographs.

Preslip MRI Findings

MRI may show:

Physeal widening

and

Bone marrow edema adjacent to the physis.

These findings can precede visible displacement.

CT

CT may define:

Severe deformity

or help with complex preoperative planning, but is not routinely required for straightforward diagnosis.

Differential Diagnosis

Important alternatives include:

Perthes disease

Proximal femoral fracture

Femoral neck stress fracture

Transient synovitis

Septic arthritis

and other causes of adolescent:

Hip or knee pain.

Perthes Disease

Perthes disease typically affects younger children, often approximately:

4–8 years old.

It may present with:

Limp

and relatively mild pain.

Radiographs distinguish it from:

SCFE.

Proximal Femoral Fracture

True proximal femoral fractures in children and adolescents are usually associated with:

High-energy trauma.

Femoral Neck Stress Fracture

Femoral neck stress fractures are more common near or after:

Skeletal maturity.

They occur more distally along the:

Femoral neck

rather than through the physis.

Treatment

General Principles

Once SCFE is suspected or diagnosed:

Weight bearing should stop immediately.

The central goal is to:

Prevent additional displacement.

Initial Management

The patient should be placed on:

Strict non-weight-bearing precautions

and referred urgently for:

Orthopaedic surgical management.

Admission

Many patients are admitted for:

Prompt operative stabilization.

In Situ Fixation

The standard treatment for most stable slips is:

Percutaneous in situ screw fixation.

Goal of Fixation

The purpose is to:

Prevent further slipping

and allow the:

Physis to close.

Surgical Technique

A guidewire is placed percutaneously from the:

Anterior or anterolateral femoral neck

into the center of the:

Femoral epiphysis.

Cannulated Screw

A cannulated screw, historically approximately:

6.5–7.3 mm

is advanced over the guidewire.

Screw Position

The screw should achieve secure fixation while avoiding penetration of the:

Subchondral articular surface.

Joint Penetration

Screw penetration into the:

Hip joint

can damage cartilage and increase the risk of:

Chondrolysis.

Number of Screws

For most stable SCFE cases, a:

Single centrally positioned screw

is typically sufficient.

Unstable or Severe SCFE

Management of unstable severe slips is more controversial because of the high risk of:

Osteonecrosis.

Reduction

Some surgeons use:

Gentle positioning

or cautious reduction.

Forceful manipulation should be avoided because it may further damage the:

Retinacular blood supply.

Modified Dunn Procedure

In selected severe slips, an open realignment procedure such as the:

Modified Dunn procedure

may be considered by experienced surgeons.

This permits correction while directly protecting the:

Femoral head blood supply.

Corrective Osteotomy

Residual severe deformity may sometimes be treated with:

Proximal femoral osteotomy

to improve:

Alignment

and

Hip mechanics.

Contralateral Prophylactic Fixation

Prophylactic fixation of the opposite hip remains:

Selective rather than routine.

Possible Indications

It may be considered in:

Very young patients

Endocrine or metabolic disorders

Renal disease

Marked skeletal immaturity

or situations in which reliable:

Follow-up is uncertain.

Screw Removal

Routine screw removal after successful fixation is generally:

Not recommended.

Physical Therapy

After surgery, patients require instruction in:

Crutch or walker use.

Weight Bearing

Patients with stable slips may progress to:

Partial weight bearing

according to the surgeon’s protocol and evidence of:

Healing and stability.

Rehabilitation

Physical therapy may address:

Gait

Hip motion

Strength

and safe progression of:

Weight bearing.

Late Degenerative Disease

Patients who later develop severe hip degeneration may require:

Reconstructive procedures.

Historically these have included:

Hip fusion in selected young patients

or

Total hip arthroplasty in adults.

Follow-Up

Long-term follow-up is important because of the risk of:

Contralateral SCFE

and later:

Hip degeneration.

Contralateral Hip Monitoring

The opposite hip should be monitored clinically and radiographically when appropriate, particularly in patients with:

High bilateral risk.

Prognosis

Outcome depends primarily on: