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The trunk and the legs are connected mechanically at the large ball and socket joints of the hips. The acetabulum, the large rounded and deep hip socket with a cartilage rim, neatly covers the similarly shaped femoral head, the ball at the top of the thigh bone. This is a stable joint with deep structure and strong stabilisers. The surfaces of the hip joint are covered by an almost friction-free material called articular cartilage which allows movement to occur easily under stress, a vital ability in this joint. The greatest weight is taken in the roof of the socket and the uppermost part of the femoral head and this is where cartilage is thickest.