^*Department of Orthopedic Surgery, Rothman Orthopedic Institute at Thomas Jefferson University Hospital, Philadelphia, PA

^†Department of Neurosurgery, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH

M.P.S.—Zimmer Biomet and G.D.S.—Stryker, Zimmer Biomet. G.D.S. has received funds to travel from AOSpine and Medtronic. The remaining authors declare no conflict of interest.

Reprints: Mark J. Lambrechts, MD, Rothman Orthopedic Institute at Thomas Jefferson University, 925 Chestnut Street, 5th Floor, Philadelphia, PA 19107 (e-mail: [email protected]).