Hamstring Strain By Paul L Liebert, MD, Tomah Memorial Hospital, Tomah, WI Reviewed / Revised Oct 2021 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Topic Resources Squats Supine Active Hamstring Stretch Bridging Prone Resisted Knee Flexion A hamstring strain is a partial tear of the hamstring muscles most commonly at the musculotendinous junction.