Erratum to: International Orthopaedics (SICOT)

DOI 10.1007/s00264-014-2602-9

Reason: University’s name misspelled in the Acknowledgements - i.e. Acknowledgments: The authors thank Qinghua University for assistance with AutoCAD.

Corrected version: Acknowledgments: The authors thank Tsinghua University for assistance with AutoCAD.