Funding for this research was provided by:
RWTH Aachen University
Received: 4 September 2021
Accepted: 30 September 2021
First Online: 12 October 2021
: Approval was obtained from the Queen Mary Research Ethics Committee (QMREC2012/50). Participants were provided written and verbal information about participation. All subjects gave informed consent to participate.
: Participants shown in Figs. InternalRef removed and InternalRef removed gave consent to publish their images.
: Professor Maffulli is the Editor-in-Chief of the Journal of Orthopaedic Surgery and Research.