1. Department of Orthopaedic Surgery McKay Orthopaedic Research Laboratory, Perelman School of Medicine, University of Pennsylvania Philadelphia Pennsylvania
2. Translational Musculoskeletal Research Center Corporal Michael J. Crescenz VA Medical Center Philadelphia Pennsylvania
3. Department of Bioengineering University of Pennsylvania Philadelphia Pennsylvania
4. Department of Biomedical Engineering University of Delaware Newark Delaware
5. Department of Orthopaedic Surgery Biedermann Lab for Orthopaedic Research, Perelman School of Medicine, University of Pennsylvania Philadelphia Pennsylvania