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The ischiofemoral ligament limits the internal rotation and adduction of the hip when it is in a flexed position. [3] Some deeper fibres of the ligament are continuous with the fibres of the zona orbicularis of the capsule. [4] This ligament is less well-defined than the other two capsular ligaments of the hip joint. [4]
The zona orbicularis and proximal hip joint capsule are poorly understood. Recent studies seem to confirm that the proximal to middle part of the articular capsule, including the zona orbicularis, acts biomechanically as a locking ring wrapped around the femoral neck and thus is a key structure for hip stability in distraction.
Major ligaments conferring stability to the hip joint include the iliofemoral ligament, the ischiofemoral ligament, the pubofemoral ligament, and the ligament of the head of the femur. [20] The former three ligaments form the zona orbicularis or annular ligament which encases the femoral neck, stabilizing the joint capsule. [20]
Ischiofemoral ligament is the thickening of posterior capsule of the hip and pubofemoral ligament is the thickening of the inferior capsule. [7] In the upright position, iliofemoral ligament prevents the trunk from falling backward without the need for muscular activity, thus preventing excessive hyperextension.
With a force strength exceeding 350 kg (772 lbs), [2] the iliofemoral ligament is not only stronger than the two other ligaments of the hip joint, the ischiofemoral and the pubofemoral, but also the strongest ligament in the human body and as such is an important constraint to the hip joint. [3]
A teardrop-shaped lower portion gives origin to the iliofemoral ligament of the hip joint and borders the rim of the acetabulum. [1] Anteromedially and inferiorly to the AIIS is the iliopsoas groove, the passage for the iliopsoas muscle as it passes down to the lesser trochanter of the femur.
Capsule of hip joint; Collateral ligaments of interphalangeal joints of foot; ... Ischiofemoral ligament; L. Lateral collateral ligament of ankle joint;
As a consequence, the capsule of the hip joint attaches in the region of the intertrochanteric line on the anterior side, but a finger away from the intertrochanteric crest on the posterior side of the head. [4] The fibers of the ischiocapsular ligament attach both into the joint capsule and onto the intertrochanteric line.
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