CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY
Knee joint. Coloured X-ray of the healthy knee joint of a 72-year-old woman. Bone is blue/white and flesh is pink. This hinge joint is the largest joint in the body. It is formed where the femur (thigh bone, upper frame) meets the tibia (shin bone, lower frame). The fibula (lower right to bottom) runs parallel to the tibia. The knee is protected at the front by the kneecap or patella (not seen). The gap between the femur and tibia is lined with smooth cartilage (also not seen) to reduce friction and to protect the ends of the bones from wear and tear.
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