DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Osteoarthritis: X-ray of a hip joint (right) showing osteoarthritis. The joint on the left is comparatively normal. At lower left and right are the thigh bones. Above these is the pelvis. Osteoarthritis is a disease of the joint cartilage that is associated with changes in the underlying bone. It is recognized on X-rays by a reduction in the joint space (due to loss of cartilage), by the presence of osteophytes (bony projections), and by a ragged, irregular appearance of the remaining joint. Osteoarthritis is associated with mechanical wear and most commonly affects the elderly. Deterioration of the joint causes pain, stiffness and lack of mobility.
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