Orthopedics is the study of the human musculoskeletal system. Orthopedic doctors or surgeons, specialize in diagnosis and treatment of problems of the musculoskeletal system. The musculoskeletal system includes the bones, joints, ligaments, tendons, muscles, and nerves. Orthopedic surgeons and podiatric surgeons manage conditions that require medication or surgical intervention. Orthopedic surgeries include tissue repair of the cartilage and meniscus, carpal tunnel surgery, shoulder/knee arthroscopies to major joint replacements such as knee and hip.