^aDepartment of Orthopedic Surgery, RUSH University Medical Center, Chicago, IL

^bDepartment of Orthopedic Surgery, Hospital for Special Surgery, New York City, NY

^cDepartment of Orthopedic Surgery, Harvard Medical School, Boston, MA

^dDepartment of Orthopedic Surgery, St. George Hospital Campus, The University of New South Wales, Kogarah, Australia

^eDepartment of Orthopedic Surgery, Stanford University, Redwood City, CA

^fDepartment of Orthopedic Surgery, Columbia University, New York City, NY

^gDepartment of Neurosurgery, Virginia Mason Franciscan Health, Seattle, WA

^hDepartment of Orthopedic Surgery, Mayo Clinic, Rochester, MN

ⁱDepartment of Orthopedic Surgery, University of Virginia School of Medicine, Charlottesville, VA

^jDepartment of Orthopedic Surgery, Boston University Medical Center Boston, MA

^kDepartment of Orthopedic Surgery, Thomas Jefferson University Hospital, Philadelphia, PA

^lDepartment of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong SAR, China

^mDepartment of Orthopedic Surgery, Emory University, Atlanta, GA

The authors report no conflicts of interest.

Address correspondence and reprint requests to Dino Samartzis, DSc, Department of Orthopedic Surgery, RUSH University Medical Center, 1611 W. Harrison Street, Orthopedic Building—Suite 204G, Chicago, IL 6012; E-mail: [email protected]