Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, United States of America.|Department of Orthopaedic Surgery, San Francisco General Hospital Orthopaedic Trauma Institute, University of California, San Francisco, California, United States of America.|Department of Orthopaedic Surgery, San Francisco General Hospital Orthopaedic Trauma Institute, University of California, San Francisco, California, United States of America.|Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, United States of America.