SUSAN LEAVINES / SCIENCE PHOTO LIBRARY SUSAN LEAVINES / SCIENCE PHOTO LIBRARY
Knee joint. Coloured magnetic resonance imaging (MRI) scan of a healthy 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, upper centre) with the tibia (shin bone, lower centre). The kneecap (patella, far right) lies over the lower part of the femur. MRI scanning uses radio waves and a powerful magnetic field to image body tissues.
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