# Over a decade of experience in total knee arthroplasty with a multiradius design and fixed bearing at a single centre: Data from the Catalan Arthroplasty Registry

## TL;DR

A study analyzed over 1,300 total knee replacements at a single hospital from 2009 to 2020, finding a higher revision risk in women compared to men.

## Contribution

The study provides long-term survivorship data for a specific knee implant design and highlights gender differences in revision risk.

## Key findings

- The cumulative revision risk was 6.0% at 5 years and 6.5% at 10 years.
- Women had a higher revision risk (7.0% at 5 years, 7.5% at 10 years) compared to men (3.3% at both).
- The increased revision risk in women was statistically significant for patellar implantation.

## Abstract

Arthroplasty registers can provide feedback information on the results of arthroplasties performed by a certain institution or surgeon. The use of real‐world data to achieve real‐world evidence can help evaluate the performance of the implants used and help counsel our patients. The main objective of our study was to determine the survivorship of the total knee implant we are currently using.

A retrospective cohort study of patients who received a total knee arthroplasty from January 2009 to December 2020 in our hospital was conducted, using data from the Catalan arthroplasty registry and the Catalan health service database. Demographic and surgical data were analysed using the Kaplan–Meier method, log‐rank test and Cox proportional hazards models with the R Project software (p < 0.05).

A total of 1336 total knee arthroplasties were included in the study, of which 992 were women. The causes for revision included aseptic loosening (17), infection (29), instability (13), patellar implantation (13), arthrofibrosis (5) and quadriceps tendon rupture (1).

The cumulative risk for revision at 5 years using the Kaplan–Meier method was 6.0% and at 10 years 6.5%. Considering gender, this risk was 7.0% and 7.5% at 5 and 10 years, respectively, in women and 3.3% in men, both at 5 and 10 years (p = 0.009). A higher risk for revision in women was seen, which is considered statistically significant (p = 0.012).

Our survivorship results are comparable to those published in the literature, but with a higher revision risk in women that is only statistically significant for the whole group of reoperations and for patellar implantation, but not for the rest of the diagnoses.

Level IV.