Correction Of Alignment After High Tibial Osteotomy And Finite Element Analysis Of Proximal Tibia Mechanical Changes

Objective: To rebuild the three-dimensional finite element model of human knee joint and to analyze the mechanical distribution of the proximal tibia bone surface after correction of the different lines of force in the knee joint.To verify the rationality of Fujisawa point,knee osteoarthritis of patients with high tibial osteotomy clinical application.Methods: Three volunteers with normal knee joint were enrolled in this study.Three-dimensional CT reconstruction of knee joint was performed.Based on the DICOM data,Mimcs software was used to establish three-dimensional model of knee joint.The model was imported to ANSYS software to be meshed.The innermost tibial plateau was set at 0% and the outermost at 100%.The definition of Fujisawa point 63%of the location,about two points Fujisawa point.The simulated force lines were corrected by different lines of force at 55%,60%,62.5%,65% and 70% of the coronal plane of the tibia,and stress distribution was further analyzed by stress transmission in the proximal tibia.The experiment set the normal Standing knee joint force changes,the collection of different lines of force inside and outside the knee joint contact area and average pressure data,the line statistical analysis,compared to the best of the lower limb force line from the mechanical analysis of the perspective of verification vines Ze point of rationality,used to guide patients with osteoarthritis of knee tibial osteotomy in clinical application.Results: The three-dimensional model of knee joint was established,the material was assigned and the load of 300 N was applied to obtain the knee joint medial and lateral ventricular space of 55%,60%,62.5%,65% and 70% Contact area and average pressure.The results showed that under the condition of different force lines,the contact area and pressure difference of the medial and lateral knee joint were different,the difference was statistically significant(P <0.05;P <0.05)Near the medial and lateral knee joint space and pressure difference between the smallest difference,to obtain force in the tibial articular surface of the uniform distribution.Conclusions: Finite element analysis of the knee joint demonstrates that the contact area and mean pressure of the medial and lateral compartments of the knee are different for different lower limbs,and the best treatment of the lower limbs through 62.5% of the tibial coronal plane(Fujisawa point)Effect,thus verifying the rationality of Fujisawa point.This provides a reference for the clinical application of high tibial osteotomy in patients with knee osteoarthritis.