The hip is known as a ball and socket joint. The ball element is termed the femoral head, it is at the end of the thigh bone (femur). The socket is called the acetabulum which in turn is part of the pelvis. The joint surfaces that push against each other are covered with a structure called cartilage that is lubricated with fluid; this permits the joint to move without friction. Surrounding the hip joint are the capsule, ligaments, muscles, fascia, nerves and blood vessels. There is a structure ...
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