1 Departments of Orthopaedic Surgery (C.M.Y., H.M.L., J.D.K., and M.C.M.), Physical Medicine and Rehabilitation (S.I. and Z.I.), Anesthesiology (C.J.G.), and Neurosurgery (H.Z.), Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
2 Department of Orthopaedic Surgery, University of Maryland Medical System, Baltimore, Maryland.