1. Department of Trauma Surgery; Technical University of Munich; Klinikum rechts der Isar, Ismaninger Straße 22 81675 Munich Germany
2. Department of Orthopaedic Sports Medicine; Technical University of Munich; Klinikum rechts der Isar, Ismaninger Straße 22 81675 Munich Germany
3. Hessing Stiftung Augsburg; Hessing Straße 17 86199 Augsburg Germany
4. Department of Orthopaedics; University Rostock; Doberaner Straße 142 18057 Rostock Germany
5. Third Medical Department; Technical University of Munich; Klinikum rechts der Isar, Ismaninger Straße 22 81675 Munich Germany
6. Walter-Brendel-Centre of Experimental Medicine Munich; Ludwig-Maximilians-University of Munich; Marchionini Straße 27 81377 Munich Germany