DU CANE MEDICAL IMAGING LTD / SCIENCE PHOTO LIBRARY DU CANE MEDICAL IMAGING LTD / SCIENCE PHOTO LIBRARY
Kneecap fracture. Coloured X-ray of a broken kneecap (patella), as viewed from the side with the knee bent. The kneecap (far left, centre) is a disc of bone that covers the front of the knee joint. Here it has been broken through the middle, into two pieces. The knee, the largest joint in the body, is formed where the thigh bone (femur, top) articulates with the shin bone (tibia, bottom left) and calf bone (fibula, thin, bottom right). A fracture such as this may be due to a sport's injury.
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