ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour x-ray of an arthritic knee joint, showing erosion of cartilage on tibia, the larger of the 2 bones in the lower leg, & the resulting narrowing of joint space, with growth of bony spurs (osteophytes) across joint. Arthritis is inflammation in one or more joints, characterised by swelling, warmth, redness of the overlying skin & restriction of motion: it may be caused by many other diseases including gout & tuberculosis: Osteoarthritis occurs in old age through overuse of joint. Treatment involves using anti-inflammatory drugs or steroids, reducing pressure on joint (through losing weight) or corrective or joint replacement surgery.
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