Received: 19 December 2018
Accepted: 20 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: Written informed consent was obtained by all patients. The study was submitted to and approved by the ethics board of the University of Heidelberg (S—083/2017), including the methods and ethics of the study. The study conducted according to the Helsinki Declaration of 2008.
: Not applicable.
: CM and TG report grants paid to their institution during the conduct of the study from Zimmer Biomet, Europe and from Depuy Synthes Orthopädie Gmbh, outside the submitted work and receiving personal speaker fees and institutional support during the conduct of the study from Zimmer Biomet and AE Germany outside the submitted work. The authors declare that they have no competing interests.