1. Centre for Biomaterials Research, Faculty of Health, Medicine and Life Sciences, University of Maastricht, P.O. Box 616, 6200 MD Maastricht, The Netherlands, Department of Orthopedic Surgery, Academic Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands, Department of Radiology, Academic Hospital Maastricht, P.O. Box 5800, 6202 AZ, Maastricht, The Netherlands, and Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The...