Affiliation: | 1. Department of Radiology, Washington University School of Medicine, St. Louis, Mo;2. Program in Physical Therapy, Washington University School of Medicine, St. Louis, Mo;3. Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, Mo;4. Department of Surgery, Washington University School of Medicine, St. Louis, Mo;5. Department of Radiology, University of North Carolina, Chapel Hill, NC |