The American Academy of Orthopaedic Surgeons (AAOS) is a professional medical association of orthopedic surgeons. It is headquartered in Rosemont, Illinois, and its membership includes more than 39,000 medical doctors, researchers, and other orthopedic professionals. The organization's mission is to provide education and practice management services for orthopedic surgeons and allied health professionals, and to serve as an advocate for improved patient care. The AAOS also conducts research and provides public education on musculoskeletal health and injury prevention.