1. Orthopaedic Research Laboratory; Radboud Institute for Health Sciences; Radboud University Medical Center; P.O. Box 9101, 6500 HB Nijmegen The Netherlands
2. DePuy Synthes Joint Reconstruction; LS11 0BG Leeds United Kingdom
3. Department of Orthopaedics; Radboud Institute for Health Sciences; Radboud University Medical Center; P.O. Box 9101, 6500 HB Nijmegen The Netherlands
4. Center for Orthopaedic Biomechanics; University of Denver; 2390 S. York St. Denver 80208 Colorado
5. Laboratory of Biomechanical Engineering; University of Twente; Enschede The Netherlands