1. Department of Biomedical Engineering and Computational Biomodeling (CoBi) Core, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue (ND20), Cleveland, OH 44195 e-mail:
2. Department of Engineering Science, Auckland Bioengineering Institute, University of Auckland, Auckland 1010, New Zealand
3. Department of Mechanical Engineering, Center for Human Machine Systems, Cleveland State University, Cleveland, OH 44115
4. Department of Biomechanics, Hospital for Special Surgery, New York, NY 10021
5. Department of Mechanical and Materials Engineering, Center for Orthopaedic Biomechanics, University of Denver, Denver, CO 80210
6. Division of Applied Mechanics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD 20993