Definition: a triangular ligament attached by its apex to the anterior inferior spine of the ilium and rim of the acetabulum, and by its base to the anterior intertrochanteric line of the femur; the strong medial band is attached to the lower part of the intertrochanteric line; the strong lateral part is fixed to the tubercle at the upper part of this line; the bands diverge, forming a Y-like figure with a weak area between; among the strongest of the body's ligaments, it limits extension at the hip joint.
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