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What we call a ''hip'' is actually a ball and socket-type joint, which unites two separate bones - the thigh bone, or femur, and the pelvis. The pelvis has two cup-shaped depressions called the acetabula or sockets. The head of the femur or ball fits into the acetabulum, forming a joint which allows the leg to move forward, backward and sideways in a wide range. The acetabulum is lined with cartilage, which cushions the bones and allows the joint to rotate smoothly and with minimal friction. An envelope of tough ligaments connect the pelvis and femur, covering the joint and stabilizing it. The cartilage also makes the joint strong enough to support the weight of the upper body, and resilient enough to absorb the impact of exercise and activity.
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Last Updated ( Wednesday, 24 August 2005 )
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