1. McKay Orthopaedic Research Laboratory Department of Orthopaedic Surgery Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
2. Department of Bioengineering University of Pennsylvania Philadelphia PA USA
3. Translational Musculoskeletal Research CenterCorporal Michael Crescenz VA Medical Center Philadelphia PA USA
4. School of Biomedical Engineering, Science and Health Systems Drexel University Philadelphia PA USA
5. Division of Orthopaedic Surgery Department of Surgery Translational Research Program in Pediatric OrthopaedicsChildren's Hospital of Philadelphia Philadelphia PA USA