DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Torn hamstring. Severe bruising on the back of a man's knee due to a torn hamstring. The hamstring muscles are the powerful muscles on the back of the thigh. They are joined by tendons to the pel- vis at the top, and to the tibia and fibula (shin bones) at the bottom. Tearing of the hamstring is common in sports, particularly in sprinting. The injury is sudden and very painful. Bruising usually develops several days later, caused by bleeding into the muscle. Treatment includes applying an ice-pack to reduce swelling, and resting the injured muscle until recovered. Physiotherapy may help prevent shortening of the muscle due to scar formation.
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