Quadriceps strain is a partial tear of the small fibers of the muscles that make up the quadriceps group. The quadriceps are the large group of muscles in the front of the thigh. They consist of four muscles in each leg that run from the hips to the knees.

The Quadriceps Muscles
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A quadriceps strain can be caused by stretching the quadriceps beyond the amount of tension or stress that they can withstand.