MEDICAL PHOTO NHS LOTHIAN / SCIENCE PHOTO LIBRARY MEDICAL PHOTO NHS LOTHIAN / SCIENCE PHOTO LIBRARY
Juvenile rheumatoid arthritis. X-ray of the knees of a patient with juvenile rheumatoid arthritis. At top are the two femurs (thigh bones) and at bottom the two tibias (centre) and fibulas of the lower legs. The knees show severe narrowing of joint space due to loss of cartilage tissue. Rheumatoid arthritis is an autoimmune disorder, where the immune system attacks the body's own tissue. The juvenile form mostly starts between the ages of two and four or around puberty. Symptoms include pain, stiffness and swelling. The condition usually disappears after several years but may cause permanent joint deformity.
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