Article History
Received: 2 March 2019
Accepted: 5 November 2019
First Online: 18 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: No special funding as the study was supported by Saarland University, Department of Orthopaedic Surgery, Kirrberger Straße, Geb. 37, D-66421 Homburg (Saar), Germany.
: In Germany is no need for a specific consent of the ethic committee for biomechanical study. Therefore, only approval from the university board was obtained.