About the Authors

Albrecht Hartmann

Affiliation University Hospital Carl Gustav Carus Dresden, University Centre for Orthopaedics and Trauma Surgery, Dresden, Germany

Franziska Hannemann

Affiliations University Hospital Carl Gustav Carus Dresden, University Centre for Orthopaedics and Trauma Surgery, Dresden, Germany, University Hospital Carl Gustav Carus Dresden, Centre for Evidence-Based Health Care, Dresden, Germany

Jörg Lützner

Affiliation University Hospital Carl Gustav Carus Dresden, University Centre for Orthopaedics and Trauma Surgery, Dresden, Germany

Andreas Seidler

Affiliation Dresden University of Technology, Occupational and Social Medicine, Dresden, Germany

Hans Drexler

Affiliation University Erlangen-Nuremberg, Occupational, Social and Environmental Medicine, Erlangen, Germany

Klaus-Peter Günther

Klaus-Peter.Guenther@uniklinikum-dresden.de

Affiliation University Hospital Carl Gustav Carus Dresden, University Centre for Orthopaedics and Trauma Surgery, Dresden, Germany

Jochen Schmitt

Affiliations University Hospital Carl Gustav Carus Dresden, Centre for Evidence-Based Health Care, Dresden, Germany, Dresden University of Technology, Occupational and Social Medicine, Dresden, Germany

Competing Interests

AH: remuneration for lecture Aesculap, Zimmer; paid consultancy for this work by German Osteoarthritis Society. FH: Paid employment for this work by German Osteoarthritis Society. JL: Financial support for educational activities (Aesculap, Bayer, Mathys) and re-search funding (Aesculap, Mathys, Smith & Nephew, Stryker). AS: Paid consultancy for this work by German Osteoarthritis Society. HD: none. KPG: Financial support for educational activities (Aesculap, Link, Zimmer) and re-search funding (Aesculap, DePuy, Smith & Nephew, Zimmer). JS: Paid consultancy for this work by German Osteoarthritis Society. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Analyzed the data: AH FH JL AS HD KPG JS. Wrote the paper: AH FH JL AS HD KPG JS.