A few small studies have shown some effectiveness in decreasing the pain of knee arthritis, and some studies have shown that it can relieve morning stiffness and pain in the hands of patients with rheumatoid arthritis for up to four weeks. However, more recent well-designed, controlled studies, have found no benefit from low-energy lasers in relieving pain in rheumatoid arthritis or other musculoskeletal conditions. Although positive effects were found in a few earlier studies, it was not clear that the pain relief achieved was enough to have either clinical significance or to replace conventional therapies.
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