SUSAN LEAVINES / SCIENCE PHOTO LIBRARY SUSAN LEAVINES / SCIENCE PHOTO LIBRARY
Knee joint. Coloured magnetic resonance imaging (MRI) scan of a healthy human knee joint seen from the side. Skin is green, bones are blue and other internal tissues are orange. The femur (thigh- bone, top) articulates with the tibia (shin-bone, bottom) at the knee to form the knee joint. The patella or kneecap (upper right) is a protective bone at the front of the knee held in position by muscles and tendons. This joint, the largest in the body, allows a backward-forward hinge movement with slight rotation. MRI scanning views slices through the body using radio waves.
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