Department of Orthopaedics and Traumatology, University Medical Center of the Johannes-Gutenberg University Mainz, Langenbeckstrasse 1, 55131 Mainz, Germany; GALENOS Mainz, Helix Medical Excellence Center, Haifa-Allee 24, 55128 Mainz, Germany. Electronic address: philipp.appelmann@unimedizin-mainz.de.