If the broken bone does not heal properly, the joint may slowly wear down. Blood flow through the femoral head may be restricted or cut off leading to the necrosis of the joint. It is formed where the round head of the thigh bone or femur joins with the acetabulum or socket of the pelvic bone. The hip joint is on the of the body's largest weight-bearing joints. A healthy hip joint allows you to walk, squat, and turn without pain.
Cartilage is a layer of smooth, soft tissue that covers the bones of the hip joint.
It is also surrounded by a lubricating synovial lining. The cartilage absorbs stress and allows the ball to glide in the socket. Muscles power the hip and leg for movement. Tendons attach the muscles to the bones.