1. Department of Mechanical Engineering and Materials Science; Washington University in St. Louis; 1 Brookings Drive, Campus Box 1185 St. Louis Missouri 63130
2. Department of Biomedical Engineering; Washington University in St. Louis; 1 Brookings Drive, Campus Box 1185 St. Louis Missouri 63130
3. Department of Orthopaedic Surgery; Washington University in St. Louis; 1 Brookings Drive, Campus Box 1185 St. Louis Missouri 63130