CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Knee joint. X-ray of a healthy human knee joint seen from the side. The knee is the largest joint in the body. It is formed by the articulation of the femur (thigh-bone, right) with the tibia (shin-bone, lower left). Cartilage (not seen) prevents the two bones from rubbing against each other. The second bone of the lower leg, the fibula, can be seen to the right of the tibia. The joint is protected by the patella, or kneecap (seen as a faint line over the end of the femur), a small bone held in place by tendons and muscles. The knee joint allows a backward-forward hinge movement with slight rotation.
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