JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Arthritis. Artwork of a front view of a human knee joint affected by rheumatoid arthritis. The knee cap (patella, yellow) is at upper centre, between the thigh bone (femur, above), and the shin bone (tibia) and fibula (below). The protective layer of cartilage (pink) covering the joint has worn away in patches. The fibrous pink tissues are tendons and ligaments, which hold muscles and bones together inside joints. Rheumatoid arthritis occurs when the immune system attacks the bones and soft tissues of a joint. The joints may become swollen, painful, stiff and deformed. Treatment is with anti-inflammatory drugs.
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