aAO Research Institute Davos, Davos, Switzerland;

bDepartment of Surgery, Cantonal Hospital Graubuenden, Chur, Switzerland;

cDepartment of Orthopedic Surgery, UZ Leuven, Leuven, Belgium;

dUniversity Hospital Basel, Basel, Switzerland; and

eUniversity of Basel, Basel, Switzerland.

Reprints: Jana Felicitas Schader, MD, AO Research Institute Davos, Clavadelerstrasse 8, Davos Platz 7270, Switzerland (e-mail: [email protected])

Authors I. Zderic, and B. Gueorguiev are full time employees of the AO Research Institute Davos at the AO Foundation and receive salary support from this institution.

This investigation was performed with the assistance of the AO Foundation. C. Sommer and K. Stoffel received benefits in terms of travel from a commercial party (DePuy Synthes) related directly to the subject of this study.

The authors report no conflict of interest.

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