Hua Xijin, Li Junyan, Wilcox Ruth K, Fisher John, Jones Alison C
Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
School of Science and Technology, Middlesex University, London, UK.
Proc Inst Mech Eng H. 2015 Aug;229(8):570-80. doi: 10.1177/0954411915592656. Epub 2015 Jun 24.
Parameterised finite element models of the human hip have the potential to allow controlled analysis of the effect of individual geometric features on the contact mechanics of the joint. However, the challenge lies in defining a set of parameters which sufficiently capture the joint geometry in order to distinguish between individuals. In this study, a simple set of parameters to describe the geometries of acetabulum and cartilage in the hip were extracted from two segmentation-based models, which were then used to generate the parameterised finite element models for the two subjects. The contact pressure and contact area at the articular surface predicted from the parameterised finite element models were compared with the results from the segmentation-based models. The differences in the predicted results between the parameterised models and segmentation-based models were found to be within 11% across seven activities simulated. In addition, the parameterised models were able to replicate features of the contact pressure/area fluctuations over the loading cycle that differed between the two subjects. These results provide confidence that the parameterised approach could be used to generate representative finite element models of the human hip for contact analysis. Such a method has the potential to be used to systematically evaluate geometric features that can be captured from simple clinical measurements and provide a cost- and time-effective approach for stratification of the acetabular geometries in the patient population.
人体髋关节的参数化有限元模型有潜力对个体几何特征对关节接触力学的影响进行可控分析。然而，挑战在于定义一组能够充分捕捉关节几何形状以区分个体的参数。在本研究中，从两个基于分割的模型中提取了一组简单的参数来描述髋关节中髋臼和软骨的几何形状，然后将其用于为两名受试者生成参数化有限元模型。将参数化有限元模型预测的关节表面接触压力和接触面积与基于分割的模型结果进行比较。发现在模拟的七种活动中，参数化模型和基于分割的模型之间的预测结果差异在11%以内。此外，参数化模型能够复制两名受试者之间在加载周期内接触压力/面积波动的特征。这些结果表明，参数化方法可用于生成用于接触分析的具有代表性的人体髋关节有限元模型。这种方法有可能用于系统评估可从简单临床测量中获取的几何特征，并为患者群体中髋臼几何形状的分层提供一种经济高效的方法。
