人工股骨头置换治疗骨质疏松股骨转子间不稳定骨折的有限元应力分析

背景：通常的力学实验手法基本上无法直接应用于人体且模型间可比性低，对人体的力学行为进行有限元数值模拟就成为深化对人体认识的一种有效手段。 目的：运用计算机模拟骨质疏松股骨转子间不稳定型骨折人工股骨头置换，并做置换后股骨及假体的应力分析，评估置换后假体的初始稳定性。 方法：对志愿者双下肢进行薄层CT扫描获得股骨数据，图像处理软件Mimics11.1进行图像处理后数据导入建模软件UG4.0建立股骨三维模型；假体柄与股骨间行布尔运算，分为正常关节置换组和转子间骨折人工关节置换组，观察两组材料赋值、定义接触、受力加载、应力分析等情况。 结果与结论：人工关节置换改变了股骨的受力方式，股骨转子间骨折关节置换后的假体稳定性较好，在正常载荷下人工关节稳定。

Artificial femoral head replacement for treatment of osteoporosis-induced unstable intertrochanteric fractures: A finite element stress analysis

BACKGROUND:Usual mechanics experiment approach cannot be applied directly to human body and the inter-comparability of models is low. Therefore finite element numerical simulation to mechanical behavior of human body has become an effective method for better understanding of the human body. OBJECTIVE:Based on computer simulation of unstable intertrochanteric fractures of femoral head replacement, to perform a stress analysis of the femur and prosthesis after replacement and to evaluate the initial stability of the prosthesis. METHODS:Both lower extremities of the volunteers underwent thin CT scan to obtain data related to the femur. The image data were input into Mimics11.1 image processing software for image processing; then, the data were input into UG4.0 software for modeling. The Boolean calculation was performed between the prosthesis and the femur. There were two groups: normal joint replacement group and artificial joint replacement group. Material assignment, definition of contact, force load, and stress analysis were observed in the two groups. RESULTS AND CONCLUSION:Artificial hip joint replacement changes the force trends; the stability of prosthesis for intertrochanteric fractures after joint replacement is good, and the artificial joint maintain stable under normal load.