Funding for this research was provided by:
Received: 18 August 2020
Accepted: 21 December 2020
First Online: 13 January 2021
Ethics approval and consent to participate
: The biomechanical study was approved by the ethics committee (Letter of the Ethical Committee, University Hospital Marburg, Oct., 12th, 2010). Written consent was obtained from donors for anatomical donation for the purposes of medical research.
: Not applicable.
: All authors declare no conflict of interest with this work. LO, TK, MB and SR have no conflict of interest at all. AK and HPM gave lectures on that topic on several spine conferences.