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Knee replacement. Coloured X-ray of the front view of a man's knees, showing a prosthetic knee implant (green, left) and a normal knee (right). The implant is attached by pegs (at upper and lower centre) into the femur and tibia bones (orange) respectively, with surgical cement. The prosthetic joint hinges in an identical way to the normal knee joint. The implant replaced the old joint that had become damaged or lost cartilage, possibly due to an accident or osteoarthritis. Healthy cartilage reduces friction between the bones, and its progressive loss causes joint pain and immobility.
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