Development of a Knee Joint CT-FEM Model in Load Response of the Stance Phase During Walking Using Muscle Exertion, Motion Analysis, and Ground Reaction Force Data
Development of a Knee Joint CT-FEM Model in Load Response of the Stance Phase During Walking Using Muscle Exertion, Motion Analysis, and Ground Reaction Force Data
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DOI：
10.3390/medicina56020056
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发表时间：
2020-02-01
影响因子：
2.6
通讯作者：
Mori, Koichi
中科院分区：
文献类型：
--
作者：
Watanabe, Kunihiro;Mutsuzaki, Hirotaka;Mori, Koichi
背景和目标：目前尚无基于任何计算机断层扫描（CT）-有限元模型（CT-FEM）的行走期间关节应力分布的报告。本研究的目的是开发一个计算模型的负荷反应（LR）阶段，最繁重的阶段对膝盖，在步行过程中使用有限元方法的定量CT图像。材料和方法：对一位43岁男性的右膝进行检查，他没有膝关节骨关节炎或手术史。使用CT获得膝关节的图像，并在LR阶段将伸展位置图像转换为屈曲角度图像。骨由异质材料组成。韧带由桁架元件制成;因此，它们在扩张或收缩期间不会产生应变，并且不会影响反作用力或压力。膝关节的构造包括韧带、软骨和半月板的材料特性。计算膝关节周围的伸肌和屈肌，并将其设定为肌肉运动张力。垂直施加地面反作用力以抑制膝关节的旋转，并限制大腿。结果：使用运动分析仪、地板反力计和肌肉牵引力计算构建了有限元模型。在正常膝关节中，LR阶段的等效应力和关节接触反力分布在股骨和胫骨的内上表面的宽区域上。结论：我们开发了一个计算模型，在LR阶段的膝关节在步行过程中使用CT-FEM。使用该模型可以开发评估异型风险、转化机制、预防膝关节骨关节炎和治疗的方法。
Background and objectives: There are no reports on articular stress distribution during walking based on any computed tomography (CT)-finite element model (CT-FEM). This study aimed to develop a calculation model of the load response (LR) phase, the most burdensome phase on the knee, during walking using the finite element method of quantitative CT images. Materials and Methods: The right knee of a 43-year-old man who had no history of osteoarthritis or surgeries of the knee was examined. An image of the knee was obtained using CT and the extension position image was converted to the flexion angle image in the LR phase. The bone was composed of heterogeneous materials. The ligaments were made of truss elements; therefore, they do not generate strain during expansion or contraction and do not affect the reaction force or pressure. The construction of the knee joint included material properties of the ligament, cartilage, and meniscus. The extensor and flexor muscles were calculated and set as the muscle exercise tension around the knee joint. Ground reaction force was vertically applied to suppress the rotation of the knee, and the thigh was restrained. Results: An FEM was constructed using a motion analyzer, floor reaction force meter, and muscle tractive force calculation. In a normal knee, the equivalent stress and joint contact reaction force in the LR phase were distributed over a wide area on the inner upper surface of the femur and tibia. Conclusions: We developed a calculation model in the LR phase of the knee joint during walking using a CT-FEM. Methods to evaluate the heteromorphic risk, mechanisms of transformation, prevention of knee osteoarthritis, and treatment may be developed using this model.