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Mortality following revision total knee arthroplasty: a matched cohort study of septic versus aseptic revisions
1The Harris Orthopedic Laboratory and Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts.
Abstract:
We report the medium-term mortality after septic versus aseptic revision total knee arthroplasty (TKA) and factors that can contribute to mortality in revision TKA. Mortality rates of 88 patients undergoing septic revision (septic group) were compared with age- and year of surgery-matched 88 patients of aseptic revision (aseptic group). The overall mortality after revision TKA was 10.7% at a median of 4 years of follow-up (range, 2-7 years). However, the mortality after septic revision (18%, 16/88) was six times higher than that of aseptic revision (3%, 3/88) (P = 0.003). Infections with Staphylococcus aureus and/or methicillin resistance was not associated with higher mortality rates. Multivariate analysis indicated that increased age (P < 0.001), higher ASA class (P = 0.002), and septic revision (P < 0.001) were identified as independent predictors of increased mortality after revision TKA.
Insights
Septic revision total knee arthroplasty (TKA) carries a sixfold higher mortality risk compared to aseptic revision. Increased age, higher ASA class, and septic revision independently predict mortality after TKA.
Area of Science:
- Orthopedic Surgery
- Infectious Disease
- Biostatistics
Background:
- Revision total knee arthroplasty (TKA) is performed to address complications or failure of primary TKA.
- Septic and aseptic failures represent distinct challenges in revision TKA.
- Understanding mortality differences and predictors is crucial for patient management.
Purpose of the Study:
- To compare medium-term mortality between septic and aseptic revision TKA.
- To identify independent predictors of mortality in patients undergoing revision TKA.
Main Methods:
- Retrospective comparison of 88 patients undergoing septic revision TKA with 88 age- and year-matched aseptic revision TKA patients.
- Median follow-up of 4 years (range, 2-7 years).
- Multivariate analysis to identify independent predictors of mortality.
Main Results:
- Overall mortality after revision TKA was 10.7%.
- Mortality was significantly higher in the septic revision group (18%) compared to the aseptic group (3%) (P = 0.003).
- Increased age, higher ASA class, and septic revision were independent predictors of mortality.
Conclusions:
- Septic revision TKA is associated with substantially higher mortality than aseptic revision TKA.
- Age, ASA class, and the reason for revision (septic vs. aseptic) are critical factors influencing survival after revision TKA.
- Targeted interventions for high-risk patients may improve outcomes in revision TKA.
