[Knee arthroplasty revision in Uruguay over a 10-year period: survival and results].

Introduction: According to the NRF (National Resource Fund) there has been an increase in the number of TKA (total knee arthroplasty) in our country. There are no studies evaluating their results. The objective of the study was to analyze survival, evaluate results and analyze the population of ATR replacements.

Material and methods: A retrospective observational and descriptive cohort study of 156 cases of ATR turnover registered in the NRF was conducted between 2004 and 2014. The analysis of the cumulative percentage of survival was performed with the Kaplan-Meier method, using re-revision as an event of interest. The WOMAC, KOOS and SANE score were used to assess functional outcomes.

Results: The cumulative percentage of survival was 85% at 10 years. The average scores were: KOOS 61.5, WOMAC 29.8 and SANE 65. Complications were recorded in 25% of cases (infection 14.10%). The average age was 71 years and 60.9% of the cases were in women. 62.82% of the replacements were of aseptic cause and in the vast majority (89.1%) constricted prostheses were used.

Conclusion: The cumulative percentage of survival of revision TKA was 86% at 10 years according to the Kaplan-Meier method. Only 51% of revisions were functional at 10 years. We must be cautious when interpreting the results obtained with this method. Acceptable functional outcomes were recorded compared to other registries, although patient satisfaction was low in more than one third of cases and there was a high percentage of complications. A trend towards an increase in the turnover rate was observed between 2004 (1.4%) and 2014 (2%).