http://en.wikipedia.org/wiki/Pelvis
When standing, with the hip joint extended, the ligaments get twisted around the femoral neck, pushing the head of the femur firmly into the acetabulum, thus stabilizing the joint.The zona orbicularis assists in maintaining the contact in the joint by acting like a buttonhole on the femoral head.The intracapsular ligament, the ligamentum teres, transmits blood vessels that nourish the femoral head.
When standing, with the hip joint extended, the ligaments get twisted around the femoral neck, pushing the head of the femur firmly into the acetabulum, thus stabilizing the joint.The zona orbicularis assists in maintaining the contact in the joint by acting like a buttonhole on the femoral head.The intracapsular ligament, the ligamentum teres, transmits blood vessels that nourish the femoral head.
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