Overview of hip labral tears

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Clinically Relevant Anatomy

The hip is one of the largest joints in the body and is a very stable ball and socket joint.  The labrum is a fibrocartilaginous structure which attaches to the acetabulum and functions to deepen the acetabulum which increases the stability of the hip joint.  The labrum is normally triangular in shape but may be be round, flat or irregular.  Although the vascular supply is controversial it is generally believed to be primarily avascular with some authors reporting blood supply to only the periphery.  Nerve endings and nerve end organs have been identified by Kim and Azum suggesting that injury to the labrum may lead to pain in the hip.

In addition to increasing the stability of the hip, the labrum also acts as a shock absorber and aids in lubricating the joint and provides for distribution of pressure.

Mechanism of Injury / Pathological Process

A labral tear can be caused by trauma as in a motor vehicle accident, a fall or injury during a sporting activity or it may be the result of repetitive microtrauma.  Groh and Herrera report findings by Kelly et al. and Philippon et al. of  "at least five etiologies of labral tears--trauma, FAI (femoroacetabular impingement), capsular laxity/hip hypermobility, dysplasia and degeneration."
Trauma - results in subluxation or dislocation of the hip damaging the labrum

FAI - results in pinching of the labrum between the acetabulum and the femoral head

Capsular laxity - may lead to labral injury as the result of a decrease in the stability of the joint causing increased pressure on the labrum

Dysplasia - any bony abnormality in the acetabulum or the femoral head or neck can lead to increased stresses on the acetabulum and/or the labrum

Degeneration - any abnormality in the joint will lead to increased stress and injury of the labrum, the cartilage and the bone.

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