Coloured X-ray of a human knee joint (side view)

Coloured X-ray of a human knee joint (side view)

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Knee joint. Coloured X-ray of a healthy human knee joint in side view, seen while bent. Two bones meet at the knee, forming a joint that works like a hinge. At top is the large femur (thigh-bone), which articulates with the tibia (shin-bone) at bottom. The patella or kneecap (upper left) is a triangular protective bone at the front of the knee held in position by muscles and tendons. Two discs of protective cartilage (not clearly visible) cover the surfaces of the femur and tibia to reduce friction between these bones. The round bottom surface of the femur forms a narrow ridge that moves through a groove in the tibia. This allows hinge movement, with slight rotation.

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Keywords: anatomy, bone, bones, femur, hinge joint, human body, joint, knee, knee joint, kneecap, normal, patella, skeleton, tibia, x-ray, xray

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