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The quantitative data were expressed as average values, standard deviations, and ranges of minimum and maximum. The qualitative data were expressed as frequencies and percentages. The survival of the implants was calculated and plotted according to the Kaplan–Meier method, with removal or change of any component as the endpoint.
The implants were followed until the last date of observation (date of death or 31 January 2023). Data analysis was undertaken using the chi squared test. The statistical analysis was performed using SPSS 14.0 for Windows, version 14.0.1 (SPSS, Chicago, IL, USA). A p-value = 0.05 was considered statistically significant.

Preoperative features, demographics and causes of revision were presented as percentages of the total cohort. Complication rates were compared using Chi Square analysis. The survival curves were calculated and plotted using Kaplan–Meier method.
Differences between groups were considered as statistically significant for p values < 0.05. The Cox multiple regression model was considered to calculate the hazard ratio.
The proportionality hazards assumption was tested by the Schoenfeld residual method; the Wald test was used to calculate the p values for data obtained from the Cox multiple regression analyses.
All data came from the registry. The study was a population study including all UKA procedures undertaken on patients living in ER reported by RIPO; therefore, the sample size was not calculated given that all the cases were included.
Revision for any cause was set as the endpoint; revision was defined as the removal or change of any implant that would impact the survival rate.
The statistical analysis was performed using SPSS 14.0 for Windows, version 14.0.1 (SPSS Inc, Chicago, IL, USA) and JMP, Version 12.0.1 (SAS Institute Inc., Cary, NC, 1989–2007).