Text and Data Mining valid from 2020-01-07
Received: 16 April 2019
Accepted: 10 October 2019
First Online: 7 January 2020
Compliance with ethical standards
: The authors declare that they have no competing interests. Some individual authors do function as paid consultants for various orthopaedic device companies which did not affect the content or direction of this publication.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants.