1. McKay Orthopaedic Research Laboratory; Department of Orthopaedic Surgery; Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania 19104
2. Department of Bioengineering; School of Engineering and Applied Science; University of Pennsylvania; Philadelphia Pennsylvania 19104
3. Translational Musculoskeletal Research Center; Corporal Michael J. Crescenz Veterans Affairs Medical Center; Philadelphia Pennsylvania 19104