DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Knee replacement surgery scars on a 70-year-old man two weeks after the operation. Both his knee joints were replaced with artificial joints. This operation is commonly carried out because of osteoarthritis, where the protective cartilage that lines the ends of the bones in the joint is worn away. This causes the joint to become stiff, painful and inflamed.
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