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Article History

Received: 29 September 2019

First Online: 2 January 2020

Compliance with ethical standards

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: Gilles Walch receives royalties from Wright Medical. Gilles Walch and Patric Raiss have consultancy contracts with Wright Medical. The other authors, their immediate families, and any research foundations with which they are affiliated have received no financial payments or other benefits from any commercial entity related to the subject of this article.

: All procedures carried out 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. The internal review board of the local university approved the study (project number S-305/2007).