SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Knee injury. Coloured X-ray of a knee joint showing metal pins (pink) inserted to mend a ruptured anterior cruciate ligament (blue). The anterior cruciate ligament prevents the tibia (shin bone, bottom) from moving too far forward relative to the femur (top). A rupture or tear of the ligament often results from a sporting injury. It causes the knee to become unstable and can lead to arthritis and other problems later in life. Repair involves reinserting the torn ends of the ligament, or reconstructing the ligament using part of the patellar tendon. The ends of the ligament (or tendon) are fixed into the bone on either side of the knee joint by metal pins.
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