Comparative stress analysis of polyethylene inserts and tibial plateaus in unicompartmental knee arthroplasty with mobile platform:observations on two tibial component posterior slopes and three femoral component positions
Objective To conduct a comparative stress analysis of polyethylene inserts and tibial plateaus during uni-compartmental knee arthroplasty with mobile platform,specifically focusing on two posterior slopes of the tibial component and three positions of the femoral component in order to provide a reference for the optimal placement of the prosthesis.Methods Finite element models of normal knee joints and unicompartmental knee arthroplasty with mobile platform were developed using software such as Mimics,Solidwork,and Geomagic Studio.In the Magics software,we simulated the uni-compartmental knee replacement surgery,and adjusted the tibial component posterior slope to 0° and 7°.The femoral com-ponent was placed at three locations:the center of the medial condyle of femur,shifted 5 mm inward,and shifted 5 mm out-ward.Stress values and distribution on polyethylene inserts and tibial plateaus were observed at knee flexion angles of 0°,30°,60°,and 90°.Results When the tibial component had posterior slopes of 0° and 7°,compared to placing the femo-ral component 5 mm inward,positioning it at the center and 5 mm outward resulted in significantly lower stress values on both polyethylene inserts and tibial plateaus(all P<0.05).When the femoral component was placed at the center and 5 mm outward positions,the stress distribution on polyethylene inserts and tibial plateaus was found to be uniform.With an in-crease in the posterior slope of the tibial component,there was no significant alteration in stress on polyethylene inserts and tibial plateaus.Conclusion In the unicompartmental knee arthroplasty,when the femoral component is placed at the cen-ter of the medial condyle of femur or slightly outward,and the posterior slope of the tibial component is controlled at 0°to 7°,the stress value of the polyethylene insert and the tibial plateau is the smallest,and the stress distribution is uniform.
unicompartmental knee arthroplastyunicompartmental knee componenttibial componentfemoral componentstress of polyethylene insertstress of tibial plateau
万方数据
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