1. McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
2. Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania.
3. Translational Musculoskeletal Research Center (TMRC), Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania.
4. DiscGenics, Inc., Salt Lake City, Utah.
5. Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, New York.