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.