Orthopedics is the field of medicine that focuses on surgery on, or manipulation of, the musculoskeletal system. The surgical specialty was originally focused on developmental deformities and the effects of polio in children, but today it has expanded significantly to address all the conditions and diseases affecting the musculoskeletal system in individuals of all ages. Orthopedic conditions can be treated operatively and nonoperatively with medications, physical therapy, exercise, alternate therapies or by a host of surgical procedures, including some that are minimally invasive and thus less traumatic to the body than traditional open surgery. The overall goal of orthopedic treatments is to preserve or restore the musculoskeletal system. Physicians whose practices are focused on orthopedics are called orthopedic surgeons, although not all of them perform surgery. An orthopedic surgeon is qualified to diagnose and manage or treat musculoskeletal system problems that affect the bones and soft tissue (ligaments, tendons) in the body.