1 Department of Orthopaedic Surgery "Koenig-Ludwig-Haus", Julius-Maximilians University Wuerzburg, Brettreichstrasse 11, 97074, Wuerzburg, Germany.
2 Clinique Chirurgicale St Michel, Groupe ELSAN, Toulon, France.
3 Department of Orthopaedic Surgery "Koenig-Ludwig-Haus", Julius-Maximilians University Wuerzburg, Brettreichstrasse 11, 97074, Wuerzburg, Germany. m-rudert.klh@uni-wuerzburg.de.