人工髋关节断柄失效的力学分析与推理（附专家点评）

目的研究人工髋关节置换术后断柄失效的力学机理以及引发断柄的具体原因,提出对临床中发生的断柄事件进行失效诊断的具体方法。方法通过二维及三维有限元分析方法对断柄过程的生物力学机理进行研究,分析断柄失效与产品、临床和患者等因素的关系。结果提出断柄分析推理路线图,成功利用有限元方法对断柄事件进行力学分析及验证。结论经强度设计和试验检测的关节柄不应发生断柄事件;失效统计分析表明断柄属小概率随机事件,是产品质量波动、临床技术误差、患者意外事故等多种非正常因素的诱发结果,对这些因素严格控制可以降低断柄失效的发生;断柄失效推理路线图可以帮助开展失效事件的原因挖掘;通过二维及三维有限元分析能够帮助判断具体断柄事件产生的力学机理。

Mechanical analysis and reasoning on fractured stem failure after total hip arthroplasty

Objective To propose some detailed methods for diagnosis of fractured stem failure in clinic by studying the mechanical mechanism of fractured stem failure and the specific causes of fracture occurrence after the total hip arthroplasty(THA).Methods The correlations between fracture stem failure and production,clinical situation and patients were analyzed by 2D and 3D finite element analysis(FEA) method to study the biomechanical mechanism of fracture processes.Results The reasoning route for fractured stem failure analysis after THA was proposed,and mechanical analysis and validation on fractured stem failure were conducted by FEA methods successfully.Conclusions Fracture should not occur on the artificial stem,for those that gone through the strength design and experimental test;statistical analysis on fractured stem failure showed that the occurrence of such fractured stem is a kind of little-probability random event,which could be induced by a variety of non-normal factors,such as fluctuations in product quality,technical errors in clinic,patient accidents and so on.Strict controls on these factors can reduce the fractured stem occurrence;the reasoning route for fractured stem failure can help to discover the reasons of failure occurrence;the mechanical mechanism of specific fracture stem occurrence can be detected by 2D and 3D FEA methods.