1. Department of Orthopaedics, University Clinic of Orthopaedics and Trauma Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria
2. Radiology Center Vienna, Lazarettgasse 25, 1090 Vienna, Austria
3. Department of Orthopaedics and Trauma Surgery, University Clinic Knappschaftskrankenhaus Bochum, In der Schornau 23-25, 44892 Bochum, Germany