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The capsule of hip joint, articular capsule, or capsular ligament is strong and dense attachment of the hip joint.. Anterosuperiorly, it is attached to the margin of the acetabulum 5 to 6 mm. beyond the labrum behind; but in front, it is attached to the outer margin of the labrum, and, opposite to the notch where the margin of the cavity is deficient, it is connected to the transverse ligament ...
The iliofemoral ligament is a thick and very tough triangular capsular ligament of the hip joint situated anterior to this joint. It attaches superiorly at the inferior portion of the anterior inferior iliac spine and adjacent portion of the margin of the acetabulum; it attaches inferiorly at the intertrochanteric line.
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.
The pubofemoral ligament (or pubocapsular ligament [citation needed]) is a ligament which reinforces the inferior and anterior portions of the joint capsule of the hip joint. The ligament attaches superiorly at the superior ramus of pubis, and the iliopubic eminence ; it attaches inferiorly at the inferior portion of the intertrochanteric line ...
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.
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]
Each capsule consists of two layers or membranes: an outer (fibrous membrane, fibrous stratum) composed of avascular white fibrous tissue; an inner (synovial membrane, synovial stratum) which is a secreting layer; On the inside of the capsule, articular cartilage covers the end surfaces of the bones that articulate within that joint.
The hip joint includes the articulation of the spherical femoral head (of femur) and the concave acetabulum (of pelvis). It forms a ball-and-socket joint that is encased by an articular capsule, reinforced and stabilized by muscle, tendon, and ligaments. [18] Even so, the joint is quite flexible in movement, allowing three degrees of freedom. [19]
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