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Revision total knee arthroplasty. A survival analysis
M A Ritter1, L E Eizember, R W Fechtman
1Center for Hip and Knee Surgery, Mooresville, Indiana.
The Journal of Arthroplasty
|December 1, 1991
Summary
Revision total knee arthroplasty (TKA) shows a 97% survival rate at 6 years. However, survival analysis reveals revision TKAs have a significantly lower survival rate compared to initial knee replacements.
Area of Science:
- Orthopedic Surgery
- Biostatistics
- Medical Technology
Background:
- Revision total knee arthroplasty (TKA) outcomes are documented, but comparative analyses with primary procedures are limited.
- Conventional statistical methods for TKA outcomes analysis may exclude valuable patient data due to follow-up limitations or mortality.
Purpose of the Study:
- To apply survival analysis to evaluate the outcomes of revision total knee arthroplasty (TKA).
- To compare the survival rates of revision TKAs against primary (virgin) TKAs using survival analysis.
Main Methods:
- Survival analysis was employed to assess data from 37 revision TKAs performed by a single surgeon.
- Prosthesis removal was defined as the primary endpoint for failure in revision surgeries.
Main Results:
- Revision TKA demonstrated a 97.0% survival rate at the 6-year mark.
- Survival analysis indicated a significantly lower survival rate for secondary arthroplasties compared to index procedures over approximately 6 years.
Conclusions:
- Survival analysis provides a robust method for evaluating TKA outcomes, accommodating all patient data.
- Revision total knee arthroplasty has a high short-term survival rate, but it remains significantly lower than primary knee replacement outcomes.