From Biomet, Inc, Warsaw, Indiana; and Department of Bioengineering, University of Illinois at Chicago, Illinois.
Received June 8, 2011.
Accepted for publication July 15, 2011.
Address correspondence and reprint requests to William S. Pietrzak, PhD, Biomet, Inc, 56 E Bell Dr, Warsaw, IN 46582; E-mail: firstname.lastname@example.org
The author reports no conflicts of interest.