Received: 27 November 2019
Accepted: 24 February 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: A request for ethical approvement was submitted to the Ethics Committee (Ethikkomission der Ärztekammer Westfalen-Lippe und Medizinischen Fakultät der Westfälischen-Wilhelms-Universität Münster). The statement from the Committee was obtained before the study. The Committee declared that due to written consent of the donors originating from the anatomical institute an ethical vote by the Committee is not required.
: Not applicable
: Paradigm Spine, Wurmlingen, Germany provided the dorsal pedicle screw instrumentation system on loan free of charge and without any further conditions. No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. The authors declare that they have no competing interests.