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The number of revisions, relative risk [RR] (1994–2004 is reference), and 95% CI for each revision cause for UKAs are shown. An RR less than 1 indicates a lower risk of revision during 2005 to 2015 relative to 1994 to 2004. *The proportional hazard assumption is not fulfilled. †Adjusted for age, sex, diagnosis, fixation method, and use of patellar component.
