Acetabular labrum

Cartilaginous structure in the hip joint

The acetabular labrum is a ring of cartilage that surrounds the acetabulum of the hip joint. It plays a crucial role in maintaining the stability and function of the hip joint by deepening the socket and providing a seal for the femoral head.

Anatomy

The acetabular labrum is a fibrocartilaginous structure that attaches to the rim of the acetabulum. It is triangular in cross-section and is continuous with the transverse acetabular ligament at the inferior aspect of the acetabulum. The labrum increases the depth of the acetabulum, enhancing the stability of the hip joint by providing a larger surface area for the articulation with the femoral head.

Function

The primary function of the acetabular labrum is to stabilize the hip joint. It acts as a seal, maintaining the negative intra-articular pressure and distributing the load across the joint. This helps to protect the articular cartilage and reduce the risk of osteoarthritis. The labrum also plays a role in proprioception, providing sensory feedback about the position of the joint.

Clinical significance

Injuries to the acetabular labrum, such as tears, can lead to hip pain and dysfunction. Labral tears are often associated with femoroacetabular impingement and can result from trauma, repetitive motion, or degenerative changes. Diagnosis is typically made using magnetic resonance imaging (MRI), and treatment may involve conservative management or surgical intervention, such as arthroscopic repair.

Surgical considerations

Surgical repair of the acetabular labrum aims to restore the normal anatomy and function of the hip joint. Techniques include labral debridement, repair, or reconstruction, depending on the extent of the injury. Postoperative rehabilitation is crucial for optimal recovery and return to activity.

Related pages

• Hip joint
• Femoral head
• Transverse acetabular ligament
• Femoroacetabular impingement

Gallery

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  Illustration of the acetabular labrum