DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Hip replacement. X-ray of the leg of a 66-year-old man with a total hip joint replacement (white). The prosthesis consists of a ball and shaft attached to the top of the femur (thigh bone, lower left), and a socket (centre, of which its metal ring is seen), which is fitted into the pelvis. The prosthesis replaced an osteoarthritic hip joint in which the friction-reducing cartilage had been worn away.
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