aDepartment of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, CO;

bOregon State University, College of Engineering, Corvallis, OR;

cMedical College of Wisconsin, Milwaukee, WI; and

dDepartment of Orthopaedic Surgery, University of Arizona College of Medicine, Phoenix, AZ.

Reprints: Evan H. Richman, MD, 1635 Aurora Ct., Aurora, CO 80045 (e-mail: [email protected]).

The authors report no conflict of interest.