1. Department of Trauma, Hand and Reconstructive Surgery, University Hospital Muenster, Waldeyerstrasse, 48149 Muenster, Germany
2. Julius Wolff Institut for Biomechanics and Musculoskeletal Regeneration, Charité, Berlin University Hospital, Augustenburger Platz, 13353 Berlin, Germany
3. Department of Orthopedics and Traumatology, Heidelberg University Hospital, Im Neuenheimer Feld, 69120 Heidelberg, Germany