Healed leg fracture. Coloured X-ray of a healed fracture of the tibia (shin bone) of an adult man. The two ends of the broken bone have healed causing some overgrowth of the bone at the fracture site (orange, upper centre). This normal overgrowth, appearing as a lump, is known as a callus. At bottom centre, the ankle joint is seen, with the heel at bottom left.