Treat fractures and dislocations; torn ligaments, sprains, and strains; tendon injuries, pulled muscles, and bursitis; ruptured discs, sciatica, low-back pain, and scoliosis; knock knees, bow legs, bunions, and hammer toes; arthritis and osteoporosis; bone tumors, muscular dystrophy, and cerebral palsy; club foot and unequal leg length; abnormalities of the fingers and toes; and growth abnormalities. Orthopedic surgeons also perform noninvasive procedures like prescribing drugs and nutritional supplements; recommending therapeutic exercises; and immobilizing fractured bones with the use of braces, splints, and casts.