Received: 16 October 2017
Accepted: 9 February 2018
First Online: 14 February 2018
Ethics approval and consent to participate
: The study protocol was approved by the local independent ethics committee and each patient signed an informed consent. An ethics approval for this study was obtained from the Ethics Committee of the University Medicine Carl Gustav Carus, TU Dresden in 2011 (EK 288082011).
: Not applicable.
: Research support and other financial or material support have been received from the following companies: Arthrosehilfe, Aesculap, Mathys, Smith&Nephew, Stryker and Zimmer.
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