首页> 外文会议>5th Kuala Lumpur international conference on biomedical engineering 2011 >The Biomechanics Analysis for Dynamic Hip Screw on Osteoporotic and Unstable Femoral Fracture
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The Biomechanics Analysis for Dynamic Hip Screw on Osteoporotic and Unstable Femoral Fracture

机译:动态髋螺钉治疗骨质疏松和不稳定股骨骨折的生物力学分析

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摘要

Osteoporotic patient has low bone quality and often occur unstable fracture. Conventional dynamic hip screw method can provide good result on stable femoral fracture. On the unstable femoral fracture, it has high failure rate. The purpose is to investigate the biomechanics analysis for dynamic hip Screw on osteoporotic and unstable proximal femoral fracture. The specific aims are to :(1) develop the osteoporotic and unstable proximal femoral fractures model,(2) investigate the influence of lesser trochanter fixation on stress and deformation distribution. This study total reviewed 130 patients treated by dynamic hip screw surgery and classified the fracture according to AO system. Statistic data showed that the common unstable femoral proximal fracture type is A2.1 (AO classification). The osteoporotic femur model of finite element method (FEM) was developed from the CT image of 80 years patient. Loading condition assigned single-leg stance. The FEM analytic result show the lesser trochanter has a moment of rotation in dynamic fixation without wires fixation condition. Using wires to fix the lesser trochanter can enhance the structure stiffness and reduce the stress distribution in unstable intertrochanter fracture (A2.1 type).
机译:骨质疏松患者的骨质低下,经常发生不稳定的骨折。常规的动力髋螺钉法可对稳定的股骨骨折提供良好的效果。在不稳定的股骨骨折上,其失败率较高。目的是研究动态髋螺钉治疗骨质疏松和不稳定的股骨近端骨折的生物力学分析。具体目的是:(1)建立骨质疏松和不稳定的股骨近端骨折模型,(2)研究较小的转子固定对应力和变形分布的影响。本研究共回顾了130例行动态髋螺钉手术的患者,并根据AO系统对骨折进行了分类。统计数据显示,常见的不稳定股骨近端骨折类型为A2.1(AO分类)。根据80岁患者的CT图像建立了有限元方法(FEM)的骨质疏松性股骨模型。加载条件指定为单腿姿势。有限元分析结果表明,小转子在无金属丝固定的情况下,在动态固定中具有旋转力矩。用金属丝固定小转子可以提高不稳定的转子间骨折(A2.1型)的结构刚度并减少应力分布。

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