The institution of one or more of the authors (GP, OT, JS, BV, HvL and LS) has received, during the study period, funding and material support by Zimmer-Biomet and the European Knee Society Research Award, 2016. The funders have no role in the study design, data collection, and analyses. Each author certifies that neither he or she, nor any member of his or her immediate family, have funding or commercial associations (consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article. However, one of the authors certifies that he (TH), or a member of his or her immediate family, has received or may receive payments or benefits, during the study period,
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