1. Department of Mechanical Engineering and Materials Science, Washington University in St Louis, St Louis, MO, USA;
2. Program in Physical Therapy, Washington University School of Medicine, St Louis, MO, USA;
3. Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA;
4. Department of Bioengineering, University of Utah, Salt Lake City, UT, USA;
5. Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA;
6. Department of Physical Therapy, University of Utah, Salt Lake City, UT, USA;
7. Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, MO, USA