http://whqlibdoc.who.int/trs/WHO_TRS_919.pdf

It presents information and data on the global burden of musculoskeletal conditions (rheumatoid arthritis, osteoarthritis, osteoporosis, spinal disorders, and severe limb trauma), incidence and prevalence, severity and course of the conditions, health and economic indicators, and health impact and economic burden, and an inventory of published assessment instruments for the conditions. Document in pdf format; Acrobat Reader required.