1 Orthopedic Department König-Ludwig-Haus, University of Würzburg, Brettreichstr. 11, 97074, Würzburg, Germany. m-rudert.klh@uni-wuerzburg.de.
2 Department of Orthopedics, Medical University of Innsbruck, Anichstraße 35, 6020, Innsbruck, Austria. martin.thaler@i-med.ac.at.
3 Department of Orthopedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany. Boris.Holzapfel@med.uni-muenchen.de.