aDepartment of Orthopaedic Surgery, Keck School of Medicine of University of Southern California, Los Angeles, CA;

bDepartment of Orthopaedic Surgery and Rehabilitation, University of Nebraska Medical Center, Omaha, NE;

cDepartment of Orthopaedic Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA; and

dDepartment of Orthopedic Surgery, Rush University Medical Center, Chicago, IL.

Reprints: Joseph T. Patterson, MD, Department of Orthopaedic Surgery, Keck School of Medicine of University of Southern California, 1520 San Pablo St, Suite 2000, Los Angeles, CA 90033-5322 (e-mail: [email protected]).

J. T. P. reports AOTrauma North America: Research support, Johnson & Johnson: Paid consultant, Orthopaedic Trauma Association: Board or committee member. N. H. reports AAOS: Board or committee member, AJRR: Board or committee member, American Association of Hip and Knee Surgeons: Board or committee member, Corin U.S.A.: IP royalties; Paid consultant, Enovis: IP royalties; Paid consultant, Intellijoint Surgical: Paid consultant; Stock or stock Options, Zimmer: Paid consultant. K. L. G. reports American Board of Orthopaedic Surgery, Inc.: Board or committee member, Journal of Clinical Medicine: Editorial or governing board, Wolters Kluwer Health - Lippincott Williams & Wilkins: Editorial or governing board. C. L. N. reports Acuitive technologies: Paid consultant, American Board of Orthopaedic Surgery, Inc.: Board or committee member, American Orthopaedic Association: Board or committee member, Hip Society: Board or committee member, Journal of Hip Surgery: Editorial or governing board, Journal of the American Academy of Orthopaedic Surgeons: Editorial or governing board, Zimmer: Paid consultant. J. J. J. reports American Board of Orthopaedic Surgery, Inc.: Board or committee member, Hyalex: Stock or stock Options, Journal of Bone and Joint Surgery - American: Editorial or governing board; Publishing royalties, financial or material support, Medtronic Sofamor Danek: Research support, Nuvasive: Research support, Orthofix, Inc.: Paid consultant, Orthopaedic Research and Education Foundation: Board or committee member, Zimmer: Paid consultant. J.R.L. reports BD Surgiphor: Stock or stock Options, DePuy, A Johnson & Johnson Company: IP royalties; Paid consultant, Hip Innovation Technology: Stock or stock Options Hip Society: Board or committee member, Musculoskeletal Transplant Foundation: Board or committee member, Saunders/Mosby-Elsevier: Publishing royalties, financial or material support, Western Orthopaedic Association: Board or committee member.

Investigation performed at Keck School of Medicine of University of Southern California.

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