TKA with biconvex inlay patellar component yielded excellent 15-year survivorship
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Key takeaways:
- Total knee arthroplasty and routine patellar resurfacing with a biconvex inlay component yielded excellent survivorship rates at 15 years.
- Routine patellar resurfacing may be preferred vs. selective resurfacing.
Results showed patients who underwent total knee arthroplasty and routine patellar resurfacing with a cemented biconvex all-polyethylene inlay component had excellent survivorship and low rates of complications at 15-year follow-up.
Researchers performed a retrospective review of prospectively collected data from 2,530 patients (mean age, 68 years) who underwent primary TKA and patellar resurfacing with a cemented biconvex all-polyethylene inlay component of the same design between 1996 and 2007.
According to the study, mean follow-up was 20.4 years. Outcome measures included 15-year Kaplan-Meier survivorship and patient-reported clinical outcomes.
At 15 years, survivorship free from all-cause revision was 97.1%. Survivorship free from patella-related complications at 15 years was 99.7%.
Researchers noted patients had significant improvements from preoperative to postoperative values in mean Knee Society Clinical Rating System scores (88.5 to 163.72; P < .001), WOMAC scores (41.93 to 70.49; P < .001) and Veterans RAND 12-item physical component scores (29.79 to 36.18; P < .001).
“The findings of this study support the idea that routine patellar resurfacing remains a viable treatment option for present-day TKA surgery,” the researchers wrote in the study. “The reason for better results with the inlay design might relate to the relative ease of insertion of the inlay design, where over-stuffing or malpositioning of the patella is likely less common [compared] with onlay designs,” they concluded.
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