John S Lewis1, Samuel B Adams, James A Nunley, Mark E Easley. 1. 1Department of Orthopaedic Surgery, Duke University Medical Center, 200 Trent Drive, Box 3000, Durham, North Carolina 27710. 2Department of Orthopaedic Surgery, Duke University Medical Center, 200 Trent Drive, Box 2887, Durham, North Carolina 27710 3Department of Orthopaedic Surgery, Duke University Medical Center, 200 Trent Drive, Box 2923, Durham, North Carolina 27710 4Department of Orthopaedic Surgery, Duke University Medical Center, 4709 Creekstone Drive, Durham, North Carolina 27703.