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EJ wrote the first manuscript draft and took care of manuscript revisions. All other authors contributed to writing of the manuscript, and OF, LBE, AO, and LL also contributed to the registry-based data presented in the figures.
The authors thank the Danish Knee Arthroplasty Register (www.dkar.dk), the Norwegian Arthroplasty Register (www.haukeland.no/nrl/), and the Swedish Knee Arthroplasty Register (www.knee.se) for providing their data for use in this manuscript.
No conflicts of interest exist. YTK received funding for the study from competative public research funds (evo grants), the Sigrid Jusélius Foundation, and the Danish Council for Strategic Research. Otherwise, the authors have received no external funding for this review.