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Polycentric total knee arthroplasty. A ten-year follow-up study
The Journal of Bone and Joint Surgery. American Volume
|October 1, 1984
Summary
The 10-year success rate for polycentric total knee arthroplasty was 66%, with actual success in 66% of living patients. Common failures included instability and component loosening.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Polycentric total knee arthroplasty (TKA) is a surgical procedure to address knee joint issues.
- Long-term outcomes of early TKA designs are crucial for understanding prosthetic longevity.
Purpose of the Study:
- To evaluate the 10-year postoperative success rate of polycentric total knee arthroplasties.
- To identify common causes of failure in early TKA procedures.
Main Methods:
- Retrospective review of 209 polycentric TKAs performed between July 1970 and November 1971.
- Analysis of patient outcomes, including success, failure, and causes of failure, at a minimum 10-year follow-up.
Main Results:
- The calculated 10-year success probability was 66%.
- Actual success was observed in 42% of living patients and 24% in those deceased or lost to follow-up.
- Failure occurred in 34% of cases, with instability/ligament laxity (13%) and component loosening (7%) being most common.
Conclusions:
- Prior knee surgery and axial malalignment negatively impacted TKA success rates.
- Instability, loosening, infection, and patellofemoral pain were significant causes of failure in this early cohort.