Affiliation: | Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL; the Department of Orthopaedic Surgery, University of Illinois School of Medicine, Rockford Orthopedic, Rockford, IL; the JFK Medical Center, Edison-Metuchen Orthopaedic Group, Edison, NJ; and OAD Orthopaedics, Warrenville, IL |