Osteoarthritis (OA) is one of the most prevalent musculoskeletal diseases worldwide. In Denmark, it is estimated that approximately 900.000 people, or 1 out of 5 residents are suffering from OA in one or more joints. The annual socio-economic costs (treatment and loss of labour) as a direct consequence of OA in Denmark are estimated to 11.5 billion "Danish kroner" (DKK).