Hip Labral Tears

Most hip labral tears are secondary, driven by the shape of the hip, most commonly femoroacetabular impingement (FAI), and most sit anterosuperiorly.

The clinical problem. Diagnosis rests on the FADIR test and an MR arthrogram. The decisions that follow are whether the labrum is the true pain generator, what morphology is driving the tear, and how much cartilage is left. The morphology is treated alongside the labrum: treating the tear in isolation without correcting the bony pathology leads to predictable failure.

The structure. The acetabular labrum is a fibrocartilaginous structure attached to the rim of the acetabulum, triangular in cross-section and continuous with the transverse acetabular ligament inferiorly. It extends the coverage of the femoral head.

Blood and nerve supply. Blood arrives from the capsular side, supplying the peripheral third and leaving the inner free margin relatively avascular. That is a key reason peripheral detachments repair more reliably than intrasubstance degeneration. The labrum also contains free nerve endings and contributes to proprioception and nociception.

Function. The labrum creates a suction seal that contains joint fluid and maintains negative intra-articular pressure, and it stabilises the femoral head in the socket. It forms about 22% of the acetabular articulating surface and increases total surface area by 28% (28.8 to 36.8 cm²) and volume by 30%, deepening the socket and contributing to load distribution and joint lubrication. Damage compromises the seal and alters joint mechanics.

Why it tears. The mechanism differs with the morphology driving it:

• Cam FAI. An aspherical femoral head-neck junction (raised alpha angle) is forced into the acetabulum in flexion and internal rotation, shearing the labral-chondral junction from "outside-in". The result is the characteristic anterosuperior chondral delamination and labral detachment.
• Pincer FAI. Focal or global acetabular over-coverage (e.g. retroversion, coxa profunda) makes the femoral neck abut the rim, crushing the labrum and producing intrasubstance degeneration and rim ossification. A contre-coup posteroinferior chondral lesion may develop.
• Dysplasia and instability. Acetabular under-coverage transfers load and shear onto the labrum, causing hypertrophy and then tearing: an instability mechanism, fundamentally different from impingement.
• Trauma and degeneration. Dislocation, axial loading or twisting injuries, and age-related degeneration account for the remainder.

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What follows a tear. Once torn, loss of the suction seal increases cartilage consolidation and contact stress, establishing a degenerative cascade toward osteoarthritis.

History. Groin pain is the most common complaint, though patients may also describe anterior thigh, buttock or lateral hip pain. The pain is typically activity-related and may be accompanied by mechanical symptoms: clicking, catching or locking. Prolonged sitting may aggravate it, and athletes often report difficulty with sport-specific activities.

Examination. The FADIR test (flexion, adduction, internal rotation), the anterior impingement test, reproduces groin pain and is the most sensitive clinical test. The rest of the examination:

• FABER (flexion, abduction, external rotation) may reproduce pain or indicate sacroiliac pathology
• Range of motion may be reduced, particularly internal rotation in flexion if FAI is present
• Log roll may reproduce pain with minimal stress on the hip
• Gait is usually normal unless pain is significant or there is associated pathology

Radiographs. An AP pelvis and a lateral hip assess the underlying morphology: FAI, dysplasia and osteoarthritis. Measure the alpha angle and the lateral centre-edge angle.

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MRI and MR arthrography. Standard MRI shows labral pathology but may miss some tears. Direct MR arthrography is the gold standard: intra-articular gadolinium distends the joint and improves sensitivity and specificity, showing the tear's location and size and the associated cartilage damage. Leg positioning or traction can further open the chondrolabral junction to reveal a subtle tear.

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CT gives detailed bony morphology when surgery is planned.

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Classification. Tears are described by location, by type (radial, longitudinal, degeneration or detachment) and histologically. Location guides the surgical approach and prognosis:

• Anterosuperior, 85%. Zones 1-2, usually FAI-related. In Seldes' cadaveric series, 74% of tears lay in the anterosuperior quadrant.
• Posterior, 10-15%. Zones 4-5, dysplasia or trauma.
• Circumferential. Extensive damage.

The Seldes classification is histological. Type 1 is detachment at the chondrolabral junction; Type 2 is a cleavage plane within the labral substance.

Groin and lateral hip pain in the young adult is a crowded field. The labral tear is frequently the visible lesion on imaging, but it is rarely the whole story — distinguishing the true pain generator (and the driving morphology) is the core clinical skill.

The decision. The pathway runs in a fixed order: exclude advanced osteoarthritis, give non-operative care a trial, and if symptoms persist choose the operation by the morphology driving the tear rather than by the tear itself.

Algorithm

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Non-operative care. Conservative treatment may provide symptomatic relief but does not heal labral tears.

• Activity modification: avoid provocative positions and activities
• Physiotherapy: hip stability, core strengthening, range of motion
• Analgesia and NSAIDs for symptomatic relief
• Intra-articular injection of local anaesthetic/corticosteroid: diagnostic, confirming the hip as the source, and therapeutic, giving temporary relief

Surgery or physiotherapy. In UK FASHIoN, arthroscopy for FAI syndrome gave a better iHOT-33 score at 12 months than personalised hip therapy. Both arms improved, and the size of the advantage is uncertain (see the Evidence Base).

Operative indications. A symptomatic tear confirmed on MRA, failed conservative treatment, and an identifiable underlying cause to be addressed. In a well-centred hip with no major morphological driver, the algorithm reserves arthroscopic labral preservation for persistent mechanical symptoms.

Repair, not debridement. Repair is preferred. It preserves labral function and proprioception, and multiple studies show better outcomes than with debridement; the supporting studies in the Evidence Base are level III and IV (Larson and Giveans; Philippon et al.).

The operation. Hip arthroscopy is the most common approach, with access to the central and peripheral compartments. What is done to the labrum depends on the tissue:

• Repair: suture anchors reattach the labrum to the rim
• Debridement: reserved for irreparable tissue
• Reconstruction: a graft for severe damage (below)

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Address the cause. This is essential: femoral osteochondroplasty for cam, rim trimming for pincer, and periacetabular osteotomy for dysplasia.

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Outcomes. Good to excellent in appropriately selected patients. Poor prognostic factors include advanced cartilage damage and inadequate correction of the morphology.

When. Reconstruction replaces labral tissue with a graft when the native labrum is irreparable: hypoplastic, ossified or calcified, extensively degenerate, or already deficient after prior debridement. The aim is the same as repair, to restore the suction seal and the fluid-sealing biomechanics that protect the cartilage, rather than simply excising deficient tissue and leaving the joint unsealed.

Graft choice. Autograft or allograft, placed as a segmental graft to rebuild a focal deficient zone or circumferentially for global loss.

• Autograft: iliotibial band, gracilis or semitendinosus. Avoids disease-transmission risk and cost.
• Allograft: tensor fascia lata or tibialis anterior. Avoids donor-site morbidity and shortens operative time.

Technique. The deficient labrum is resected back to a healthy base, and the graft is sized and secured to the acetabular rim with suture anchors. The new rim of tissue re-establishes contact with the femoral head and restores the seal.

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The evidence. In the Elnewishy meta-analysis, reconstruction achieved improvement comparable to repair on most patient-reported outcomes, with a small modified Harris Hip Score advantage in some series. Repair remains first choice whenever the tissue is viable: the native labrum's mechanoreceptors and biology cannot be fully replaced, and repair is associated with a lower rate of conversion to arthroplasty, partly reflecting the more favourable baseline joint status of hips in which the native labrum can be saved.

Complications of the Untreated Tear

Left alone, a tear risks progressive chondral damage and osteoarthritis: loss of the suction seal raises contact stress, and persistent FAI drives the degenerative cascade. It can also leave chronic mechanical symptoms, catching, locking and instability, that limit activity and sport.

Complications of Hip Arthroscopy

Traction. Pudendal and lateral femoral cutaneous nerve neurapraxia, usually transient and from perineal-post traction; perineal or genital pressure injury; and, rarely, sciatic or femoral nerve injury. Limiting traction time and force minimises them.

Iatrogenic bony and chondral injury. Chondral or labral injury on portal placement, and femoral neck fracture from over-aggressive osteochondroplasty. At the other extreme, inadequate correction, a residual cam with the alpha angle remaining over 50 degrees, causes re-tear and failure.

Microinstability. Iatrogenic microinstability follows an unrepaired capsulotomy or rim over-resection in a borderline-dysplastic hip, and is a leading cause of failed arthroscopy.

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General and late. Heterotopic ossification (reduced by NSAID prophylaxis), infection, VTE, persistent pain, and conversion to total hip arthroplasty, a risk that rises with age, osteoarthritis and chondral damage.

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Global Epidemiology

• Labral tears are highly prevalent: cadaveric and asymptomatic-volunteer studies show labral abnormalities in the majority of older adult hips and in a large proportion of asymptomatic young athletes, so prevalence figures depend heavily on whether the population is symptomatic.
• The anterosuperior quadrant accounts for the substantial majority of tears across populations; posterior tears are uncommon and should prompt a search for dysplasia or prior trauma/dislocation.
• FAI-related labral pathology presents predominantly in active adults in the second-to-fourth decades; dysplasia-related pathology skews female and younger.

Side-by-Side Guideline / Consensus Positions

Registry & High-Volume Cohort Signals

• National and institutional hip-arthroscopy registries (e.g. UK Non-Arthroplasty Hip Registry and large North American databases) consistently report labral repair/preservation overtaking debridement as the dominant technique over the last decade, mirroring the comparative evidence.
• Predictors of conversion to total hip arthroplasty across registries are consistent: older age, pre-existing osteoarthritis/joint space narrowing, and advanced chondral damage — reinforcing careful patient selection.

High- vs Limited-Resource Practice Variation

• Well-resourced settings: MR arthrography and dedicated hip arthroscopy expertise are available; labral repair, capsular closure, and concurrent osteochondroplasty are standard, with PAO offered for dysplasia at specialist centres.
• Limited-resource settings: MR arthrography and arthroscopy may be scarce; diagnosis leans on plain radiographs, clinical tests and diagnostic injection, and management is often weighted toward optimised conservative care, with surgery reserved for, and referred to, specialist hip-preservation units.