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Hip Labrum (Posterior)

labrum acetabuli posterius

The posterior acetabular labrum is the fibrocartilaginous rim on the posterior acetabular margin, providing posterior femoral head coverage and the attachment for the posterior hip capsule.

Region: Pelvis & Hip

Biomechanics

Function & Actions

Deepens the posterior socket, provides posterior femoral head containment during hip extension and external rotation, and contributes to the posterior hip stability seal.

Clinical Relevance

Clinical Notes

Posterior labral tears are less common than anterior but occur in posterior hip impingement during extreme extension and external rotation (dance, gymnastics). In posterior hip dislocation, the labrum may be avulsed from the posterior rim, contributing to post-reduction instability.

Pathology

Common Injuries & Conditions

Posterior Labral Tear in Posterior Impingement

Posterior hip impingement from ischiofemoral compression or posterior bony impingement producing posterior labral tears in dancers and gymnasts, managed by arthroscopic labral repair.

Posterior Labral Avulsion in Hip Dislocation

Posterior labrum detachment accompanying posterior hip dislocation, contributing to recurrent instability if not repaired at the time of fracture-dislocation surgery.