Epidemiological studies on prevalence and incidence of joints and muscles disorders are scares. Two epidemiological French studies recorded patients consulting their GP for widespread pain, whatever the cause. The most often cited pain localization was the musculoskeletal system (36-59% of the cases). In Europe the situation is similar, with arthritis and osteoarthritis representing the 42% of pains. According to the WHO (World Health Organization) the musculoskeletal system's disorders are the first cause of handicap in the worldwide population.