DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Knee replacement surgery. Close-up of the prosthetic (artificial) joint during total knee replacement surgery. Prostheses have been placed into the thigh bone (femur) and shinbone (tibia) to form an artificial knee joint. Knee joints need replacing when the protective cartilage that surrounds them is lost. Cartilage can be lost due to injury or osteoarthritis.
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