U.S. Air Force Airman 1st Class Ryan Donaldson, 633rd Surgical Operations Squadron surgical technician, verifies proper screws are being used before handing them to the orthopedic surgeon during a procedure at Langley Air Force Base, Va., Feb. 5, 2013. Orthopedic surgerons use both surgical and nonsurgical means to treat musculoskeletal trauma, sports-related injuries, degenerative diseaes, infections, tumors and congenital disorders. (U.S. Air Force photo by Senior Airman Teresa Aber/Released)