HIP

The hip joint is known as a ball and socket joint. The ball, which is called the femoral head, is found at the top of the thighbone or femur and the socket is a part of the pelvis called the acetabulum. In a healthy hip, the surfaces of these two bones (i.e. where they meet and actually form the joint) are covered in a layer of cartilage which allows for smooth, pain-free sliding. The joint is surrounded by a soft tissue envelope called the capsule which seals the joint and produces a fluid which nourishes, lubricates as well as enables smooth movement.
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