An orthopaedic doctor specialises in issues, diseases and injuries pertaining to the musculoskeletal system. They treat infections, sports injuries, broken bones, joint problems (e.g. arthritis), congential conditions, degenerative conditions (e.g. osteoporosis) and bone tumors.
They handle everything from minor issues to complex procedures and surgeries, but do everything possible so that surgery is avoided and less invasive treatments are used such as medication and physical therapy.