Purpose: Stretching increases muscle-tendon flexibility, improves range of motion or musculoskeletal function, and prevents injuries. Although well-established stretching protocols are commonly used in clinical settings, the absolute and relative effectiveness of these protocols are poorly understood. Our objective was to identify and evaluate the evidence for the effectiveness of stretching in the treatment of musculoskeletal disorders.
Methods: English- and Japanese-language studies were identified through searches of MEDLINE, PEDro, CENTRAL, CINAHL, and ICHUSHI up to and including August 2009. Controlled studies (randomized controlled trials or controlled clinical trials) we selected examined patients with musculoskeletal disorders who received stretching alone. Two authors independently screened search results, assessed methodological quality, and extracted data Effect sizes and 95% confidence intervals were calculated and a meta-analysis was performed where appropriate.
Results: Twenty-five trials met the inclusion criteria. Stretching had a statistically beneficial effect on improvements in restriction of dorsiflexion movement, frozen shoulder, low-back pain, knee osteoarthritis, hamstring injuries, plantar heel pain, neck pain, and fibromyalgia. There is insufficient evidence from trials to draw conclusions on the effectiveness of stretching as a single treatment used to improve upper-limb disorders after stroke or knee flexion contractures.
Conclusion: This review provides good evidence for the beneficial effect of stretching in the treatment of some musculoskeletal disorders. However, some trials were compromised by poor methodology, including lack of blinding and incomplete outcome data. Further research, especially well-conducted randomized controlled trials, is urgently needed to confirm that stretching can improve other diseases and to determine the proper role of stretching in the clinical practice of physical therapy.
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