The Cochrane Musculoskeletal Group (CMSG), a specialized group of researchers, health-care professionals and consumer representatives, belongs to the Cochrane Collaboration, an international organization that prepares, maintains and promotes reviews of the effects of health care treatments. The CMSG produces reliable, up-to-date reviews of interventions for the prevention, treatment or rehabilitation of musculoskeletal disorders in the form of systematic reviews. Each systematic review is a synthesis of all known published controlled clinical trials and gives the best estimate of health benefits and side effects of a particular therapy.