Anatomy
A triangular or Y-shaped ligament. Its proximal attachment is to the ilium below the anterior inferior iliac spine along the margin of the acetabulum. Distally, it attaches along the intertrochanteric line of the femur. The ligament is thicker at either end, hence its Y-shape.
Functions
Provides static support to the hip joint. The ligament is orientated in a spiral fashion around the hip joint and becomes taut when the hip is extended, e.g., when standing. This stops the trunk from falling backwards, and muscles use less energy as a result. The ligament also stops hyperextension of the hip.
Clinical
As the ligament prevents hyperextension of the hip joint, great flexibility is required to perform the ‘splits’.
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