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May 25, 2013
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Pulled Hamstring
(Hamstring Muscle Strain)

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Hamstring Overview

The hamstrings are a collection of three muscles located in the back of the thigh that are responsible for bending or flexing the knee. The semitendinosus, the semimembranosus, and the biceps femoris begin as a tendon that inserts in the ischium, one of the pelvic bones, and run the length of the femur, crossing the back of the knee to attach to the tibia and fibula. A small portion of the hamstring muscle also spans across the hip joint and is involved in hip extension. The hamstring muscle fibers gradually become tendon fibers near the knee to attach to bone. One can appreciate the thick tendon bands when feeling behind the knee joint.

The hamstring muscle is balanced by the quadriceps muscles that are located on the front of the thigh and cause the knee to extend. Together the hamstrings and the quadriceps help control power and stability of the knee joint, allowing activities like walking, running, jumping, and squatting.

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A pulled hamstring can be a painful injury not only to an athlete, but also for the regular weekend warrior.

Pulled Hamstring: A Pain Real Pain in the Leg!

Medical Author: Benjamin C. Wedro, MD, FAAEM
Medical Editors: Melissa Conrad Stöppler, MD

One moment the runner is gliding down the track; the next he is collapsed in a heap clutching his thigh, writhing in pain. Another dream lost because of a pulled hamstring. While a pulled "hammy" is often thought of as an athlete's injury, it can happen to even the most unfit of us. While professional athletes suffer injuries in front of huge crowds, and millions more see the pain in slow motion on television, few people are there to watch you trip on a step.

Pulled hamstrings often happen on the playing field because the athlete is trying to push the body to perform to its maximum capacity while sprinting or jumping. For the rest of us, a pulled hamstring happens because we don't prepare for the routine activities of the day like walking or climbing steps. As we age (one risk factor), we lose flexibility (another risk factor), and we tend to lose general muscle strength and fitness, and are more susceptible to fatigue(adding even more risks).

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