SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Knee joint. Coloured X-ray of the healthy knee joint of an adult woman, seen from the front. The knee is the largest joint in the body. It is formed by the articulation of the femur (thigh bone, upper centre) with the tibia (shin bone, lower centre). The smaller fibula (right of tibia) is also seen. The kneecap (patella) is faintly seen as a circular shadow by the rounded end of the femur; it lies in front of the femur and protects the knee joint.
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