1. Department of Orthopaedic Surgery, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
2. Biomechanics Laboratory Department of Sport and Movement Sciences, University of Duisburg-Essen, Essen, Germany
3. Department of Orthopaedic Surgery, Annastift Hannover (Medical School Hannover, MHH), Hannover, Germany
4. Faculty of Health Sciences, University of Witten/Herdecke, Witten, Germany