Snapping Hip
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Direct answer
Coxa saltans — the snapping hip — divides into external, internal and intra-articular types, and the division is everything because treatment follows the type. External snapping, the commonest, is the thickened posterior border of the iliotibial band (or gluteus maximus anterior fascia) riding over the greater trochanter, visible and often audible on the outside of the hip. Internal snapping is the iliopsoas tendon flipping over the iliopectineal eminence, the femoral head or a bony prominence, felt anteriorly as the hip moves from flexion-abduction-external rotation into extension, and is bilateral in a good proportion of cases. Intra-articular snapping is not a tendon at all but a labral tear, loose body or synovial chondromatosis inside the joint — the type that mandates imaging. Dancers and athletes predominate; most cases need only explanation and physiotherapy, with surgery reserved for refractory, function-limiting snap.
What you must remember
- External type: posterior iliotibial band border or gluteus maximus fascia over the greater trochanter; often associated with trochanteric bursitis; the snap is visible and the patient can demonstrate it standing.
- Internal type: iliopsoas over the iliopectineal eminence or femoral head; reproduced by extending a flexed, abducted, externally rotated hip; may be voluntary in adolescents — ask them to snap it deliberately.
- Intra-articular type: labral tear, loose bodies, synovial chondromatosis or a snapped ligamentum teres; suspect whenever the snap follows trauma or is accompanied by catching, locking or giving way.
- Clinical separation: Ober's test for iliotibial tightness; the snapping is palpated laterally (external) or groin (internal); dynamic ultrasound can catch the tendon in the act; MR arthrography for the intra-articular suspicion.
- First-line care for all tendon types: activity modification, stretching of the iliotibial band or iliopsoas, core and abductor strengthening, and corticosteroid injection into the accompanying bursa for flares.
- Surgical options, rarely needed: iliotibial band release with a window or Z-lengthening for external; fractional lengthening or recession of the iliopsoas tendon at the lesser trochanter or pelvic brim for internal; hip arthroscopy with labral repair for intra-articular causes.
- Red flags: night pain, weight loss, systemic features — these are not snapping-hip diagnoses and demand a workup for tumour or infection before any snapping label is applied.
Sorting the three types in clinic
A 24-year-old Bharatanatyam dancer reports an audible clunk in the right groin with grand pliés. Watch first: is the snap visible from across the room (points external) or only felt in the groin (internal)? Palpate the greater trochanter while she flexes and extends — a thud under your fingers confirms external; if the groin clicks as the hip swings from figure-four into extension with a palpable tendon flip, that is the psoas. Then exclude the joint: a positive anterior impingement or FADIR test, catching or a history of trauma pushes you to MR arthrography, and if a labral tear is found, the "snapping" label was a symptom, not the disease. Treat conservatively for at least three months — psoas stretching, iliotibial release work, hip-strengthening — because snapping tendons quieten with lengthening of the tight structure more often than with anything a scalpel can do. If surgery becomes necessary, choose the least destabilising option: a psoas fractional lengthening preserves hip flexion power better than a complete tenotomy, and an iliotibial window avoids the extension weakness of a formal Z-plasty.
Where students slip
The commonest error is to treat the three types as one diagnosis and answer "physiotherapy" to every snapping-hip question — correct for the tendon types, wrong for an intra-articular loose body that belongs in arthroscopy. The second error is anatomical: candidates say the psoas snaps over the greater trochanter, conflating internal with external; the iliopsoas is anterior and crosses the iliopectineal eminence, the iliotibial band is lateral and crosses the trochanter. A viva favourite asks why dancers predominate: extreme ranges of rotation and repeated flexion-extension cycles hypertrophy and tighten the implicated tendons, and the voluntarily produced snap in adolescent gymnasts is habituation, not pathology — do not operate on a voluntary snapper. Indian exam framing loves the "bilateral painless snap in a gymnast" stem, where the correct answer is reassurance and observation.
Frequently asked questions
What are the three types of snapping hip?
External, from the iliotibial band over the greater trochanter; internal, from the iliopsoas tendon over the iliopectineal eminence or femoral head; and intra-articular, from labral tears or loose bodies within the joint.
Which type of snapping hip most often needs imaging?
Intra-articular snapping, because it signals structural joint pathology such as a labral tear or loose body, for which MR arthrography is the investigation of choice.
How is internal snapping hip confirmed clinically?
Reproduction of the groin snap as the hip moves from flexion, abduction and external rotation into extension, often with a palpable tendon flip; dynamic ultrasound can visualise the iliopsoas crossing the pelvic brim.
What is the first-line treatment for tendon-related snapping hip?
Stretching and lengthening of the implicated structure — iliotibial band or iliopsoas — with abductor and core strengthening, activity modification, and a bursal steroid injection for painful flares.
When is surgery considered for snapping hip?
After at least three to six months of failed conservative therapy when the snap is painful and function-limiting, using iliotibial window or lengthening, fractional psoas lengthening, or hip arthroscopy for intra-articular causes.