Back Pain Patients Have Less Flexible Hamstrings. Evaluations of 72 patients with low back pain indicate a possible relationship between mechanical back pain and hamstring tightness. Researchers found that patients with more severe back pain had tighter hamstrings than patients with more mild or moderate pain. They recommend this data be considered when designing both prevention strategies and rehabilitation protocols for low back pain.

Journal of Back and Musculoskeletal Rehabilitation, June 2014