aDivision of Orthopedic Surgery, Oslo University Hospital, Oslo, Norway;
bInstitute of Clinical Medicine, University of Oslo, Oslo, Norway;
cOrthopaedic Department, Sahlgrenska University Hospital, Gothenburg, Sweden; and
dDepartment of Orthopaedic Surgery, Baerum Hospital, Vestre Viken Hospital Trust, Norway.
Reprints: Frede Frihagen, MD, PhD, Division of Orthopedic Surgery, Oslo University Hospital, Postboks 4950, Nydalen, 0424 Oslo, Norway (e-mail: [email protected]).
The study was funded by the participating hospitals and by an unrestricted grant from Smith & Nephew.
F. Frihagen: Lecturing fees from Zimmer Biomet. M. R. Andersen: Lecturing fees from Arthrex Gmbh. The remaining authors report no conflict of interest.
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