ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Rheumatoid arthritis. Computer graphic representation of reddened painful areas on a human knee due to rheumatoid arthritis. Such pain would be as a result of stress on the joint between the femur (or thigh bone, upper image) and the tibia (shin bone, lower image). Rheumatoid arthritis is a type of arthritis (inflammation of the joints) which can affect the fingers, knees, wrists, feet, ankles, hips or shoulders. It is an autoimmune disorder, where the body's own defence system attacks tissues. The degree of severity varies considerably. Rheumatoid arthritis is diagnosed by the presence of the rheumatoid factor in the blood or by X-rays.
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