RESUMO
BACKGROUND: To present the long-term clinical and radiological outcomes of the Genesis I posterior cruciate-retaining total knee arthroplasty (TKA) (Smith & Nephew Orthopaedics, Memphis, TN, USA) (one of the first designed with an asymmetric tibial tray). METHODS: Prospectively collected data from 117 cemented TKAs performed on 95 patients were evaluated using this design, with a mean follow-up of 21.5â¯years (range, 18-26). Failures, complication rates, and clinical (both subjective and objective) and radiological outcomes were assessed for all patients. RESULTS: Seven failures occurred (wear and structural failure of the polyethylene insert) and six revision surgeries were performed at a mean of 10â¯years (range, three to 14) from the index operation. No revision of either the femoral or tibial components for aseptic loosening was performed. Survivorship analysis showed a cumulative success rate of 93.53% (95% CI, 92.75-94.32%) at 20 and 25â¯years, with revision for any reason as an end point. All patients showed a statistically significant improvement (Pâ¯=â¯0.001) in the Knee Society and Oxford knee rating scores. CONCLUSIONS: This study demonstrated satisfactory long-term clinical outcomes for this TKA design, with revisions being related to polyethylene wear structural failure.
