Hamstring Strain Reinjury Nearly one third of hamstring strain injuries recur within the first year following rehabilitation and a return to athletic activity. Research suggests several factors contribute to the high rate of reinjury: Persistent weakness in the injured muscle Reduced extensibility of the musculotendon unit due to scar tissue Compensatory changes in the biomechanics of movement due to the original injury Lack of strength and control of the lumbopelvic muscles Quadriceps tightness

Why this for your hamstring strain? Let’s first get a good grasp of what a muscle strain is. A muscle strain happens when we place a load through the tissue at a force and length that it wasn’t ready for, thus, we end up with tearing of the muscle fibers. For the hamstring muscle specifically, we see muscle strains happening more frequently when the hip is flexed past 90 degrees. For example, when we are running and driving the knee forward to plant it on the ground for our next stride. So how d