Acetabular labrum | |
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Details | |
Identifiers | |
Latin | labrum acetabuli |
TA98 | A03.6.07.008 |
TA2 | 1880 |
FMA | 43521 |
Anatomical terminology |
The acetabular labrum (glenoidal labrum of the hip joint or cotyloid ligament in older texts) is a fibrocartilaginous ring[1][2][3] which surrounds the circumference of the acetabulum of the hip, deepening the acetabulum. The labrum is attached onto the bony rim and transverse acetabular ligament. It is triangular in cross-section (with the apex represented by the free margin).[2][3]
The labrum contributes to the articular surface of the joint[2][1] (increasing it by almost 10%[1]). It embraces the femoral head,[2] holding it firmly in the joint socket[3] to stabilise the joint. It thus also seals the joint cavity, facilitating even distribution of synovial fluid so that friction is reduced and dissolved nutrients are better distributed.[2]
The labrum is about 2 to 3 mm thick but is wider and thinner in the anterior portion. The anterior portion of the labrum is most susceptible to an acetabular labrum tear.[4]
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