The hamstrings, comprised of the semimembraneus, semitendinosis, and the bicep femoris, are in the back of the thigh. They are two joint muscles, responsible for extending the hip, as in standing straight up from a bent over position, and for bending the knee.
The bicep femoris is the most commonly injured of the hamstrings, followed by the semitendinosis. An injured hamstring may take up to a year to heal and reinjury within a year is common.
The hamstrings are very important for walking, running, jumping, and trunk control. They are critical in walking as they work opposite the quadriceps to slow down the knee.
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