From the Department of Orthopaedics (Wiznia), Yale School of Medicine (O'Connor), Center for Musculoskeletal Care, Yale School of Medicine, New Haven, CT; Department of Orthopedic Surgery, Mayo Clinic College of Medicine and Science (Clarke), Rochester, MN.

None of the following authors or any immediate family member has received anything of value from or has stock or stock options held in a commercial company or institution related directly or indirectly to the subject of this article: Wiznia, O'Connor, and Clarke.