# Identifying patients at risk in revision arthroplasty: a comprehensive single-centre analysis

## TL;DR

This study identifies key risk factors for complications in revision hip and knee surgeries to improve patient care and hospital planning.

## Contribution

The study provides new insights into specific risk factors for adverse events in revision arthroplasty procedures.

## Key findings

- Infection was the strongest predictor of adverse events and longer hospital stays.
- Periprosthetic fractures were highly predictive of complications in revision knee surgeries.
- Advanced age and high comorbidity burden were critical determinants of adverse outcomes.

## Abstract

The demand for revision hip and knee arthroplasty (rTHA/rTKA) is increasing, while they continue to be associated with greater perioperative risks, higher resource demands, and greater variability in outcomes compared with primary procedures. Identifying precise risk factors is essential for effective perioperative management and resource planning.

A retrospective analysis of 2,123 revision total hip (rTHA, n = 1,301) and knee arthroplasties (rTKA, n = 822) performed from 2010 to 2019 at a tertiary German centre was conducted. Adverse events (AE), length of hospital stay (LOS), and predictors including age, Elixhauser Comorbidity Index (EI), joint type, and indication were analysed using multivariate regression models.

The overall AE rate was 13.1%, significantly higher in rTHA than in rTKA (12.6% vs. 8.8%; p = 0.008), particularly for infections and mechanical complications. Mean LOS was 19 ± 14 days. Infection, age, EI, joint type, dislocation, and periprosthetic fracture independently predicted AE and LOS. Infection was the strongest predictor overall (AE: OR 5.4; LOS: Coefficient 1.6), with periprosthetic fractures being highly predictive in rTKA (OR 9.8).

Infection (in all revisions), periprosthetic fractures (in rTKA), advanced age, and high comorbidity burden were critical determinants of perioperative adverse events and hospital utilisation. Focused perioperative care strategies targeting these risk groups are essential to mitigate adverse outcomes and optimise healthcare resources.

The online version contains supplementary material available at 10.1186/s13018-025-06625-y.