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Acetabular labrum

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Bones, ligaments, movements, blood supply and innervation of the hip joint.

The acetabular labrum is a fibrocartilaginous collar that surrounds the margin of the acetabulum and the outer edge of the transverse acetabular ligament that bridges the acetabular notch. It is derived from the Latin word 'labrum,' meaning 'lip'.

This structure raises the rim of the acetabulum slightly, deepening the socket of the acetabulum and increasing the articular surface area of the acetabulum by about 10%.

Due to the elevated rim and labrum, over half of the femoral head fits within the acetabulum. Thus, the acetabular labrum contributes to the stability of the hip joint by increasing the contact area between the acetabulum and the femoral head. Additionally, the acetabular labrum seals the hip joint and helps maintain optimal distribution of synovial fluid within the joint cavity.

English: Acetabular labrum
Synonym: Glenoid labrum of hip

Labrum acetabuli
Synonym: Labrum glenoidale coxae
Definition Fibrocartilaginous rim attached to the acetabular margin
Function Deepens the acetabulum
Contributes to the stability of the hip joint articulation
Seals the hip joint and maintains synovial fluid within the joint cavity

Learn more about the acetabular labrum in the following study unit:

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