BSIP / SCIENCE PHOTO LIBRARY BSIP / SCIENCE PHOTO LIBRARY
Knee joint. Coloured X-ray of a healthy knee joint. This hinge joint is the largest joint in the body. It is formed from the junction of the femur (thigh bone, upper frame) with the tibia (shin bone, lower frame). The fibula (lower right) runs parallel to the tibia to the ankle (not seen). The kneecap, or patella (not seen), protects the joint at the front. The gap between the femur and tibia is lined with smooth cartilage to reduce friction and protect the ends of the bones.
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