改良动力髋螺钉系统的三维有限元分析

Three-dimensional finite element analysis of modified dynamic hip screw system

目的通过三维有限元分析比较改良动力髋螺钉(DHS)系统——防旋自锁钢板与传统DHS系统的生物力学特性。方法基于有限元软件ANSYS分析平台分别建立防旋自锁钢板和传统DHS两套内固定系统的三维有限元模型,观察其应力分布、位移等力学性能指标的差异。结果防旋自锁钢板模型的最大应力及位移均低于传统DHS模型且应力分布总体均匀。结论与传统DHS系统比较,防旋自锁钢板具有更好的生物力学稳定性和内固定强度,对于合并严重骨质疏松或骨折粉碎程度高的患者可能更具优势。

Objective To compare the difference of biomechanical properties between modified dynamic hip screw（DHS） system—anti-rotation self-locking plate and traditional DHS system through 3 D finite element analysis. Methods Using ANSYS software as an analysis platform, 3 D finite element models of both internal fixation systems of anti-rotation self-locking plate and traditional DHS were established respectively, and the stress distribution and the displacement of the fixators were compared between the models. Results The maximum stress and maximum displacement in anti-rotation self-locking plate models were lower than those in traditional DHS models, and the sress in anti-rotation self-locking plate showed well-distributed. Conclusion Compared with traditional DHS, the anti-rotation self-locking plate seems to have more advantages for patients combined with severe osteoporosis or serious comminuted fracture because of its better biomechanical stability and greater fixation strength.