股骨颈骨折中空钉内固定的有限元分析

运用Mimics医学有限元仿真软件对股骨的CT图像进行了分割、精炼和渲染处理，并运用Geomagic Studio逆向工程软件进行了股骨NURBS曲面重构，从而建立了股骨的几何模型，导人ANSYS11．0建立有限元模型后进行力学分析。在单钉固定的情况下对骨折线Pauwel’s角为50°的经颈型骨折模型施加载荷，通过不同固定角度时的力学特征综合评价固定效果，并找出最佳固定角度；对该最佳固定角度进行三钉内固定的接触计算和分析，考虑中空钉和股骨之间的接触以及摩擦作用，分析不同的摩擦系数对于固定方式的影响。单钉内固定计算结果表明当Pauwel’s角为50°时，中空钉固定角度在30°-55°均可以取得良好的力学效果，并以50°最佳；三钉内固定计算结果表明摩擦系数的不同对结果有一定的影响，采用不同．的摩擦系数后，计算结果最大相差6．84％。

The Finite Element Analysis of Femoral Neck Fracture Internal-Fixed with Screw

Femoral reality geometric model was created after CT images were modified by image segmentation, refining and rendering using biomedical simulated software Mimies, and femoral NURBS curves were re-constructed using reverse engineering software Geomagic Studio, which was subsequently input into ANSYS 11.0 to establish Finite element model. A femoral neck fracture with Pauwel＇ s angle of 50°and fixed with a single screw was used to find out the best fixed angle with sound biomechanical principle. Internal-fixed with 3 screws were then used to contact calculate and analyse at this best fixed angle. The surfaces between the femoral and screw were considered as contact ones, and different friction factors were also taken into account. All the angles of internal-fixed from 30° to 55°gained satisfying effects , and the best result was obtainable at the angle of 50°. It was found that the friction factor affected the result, the differential rate of the results using different friction factors was up to 6.84%.