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目的构建较高仿真度的6岁儿童乘员下肢有限元模型,验证6岁儿童乘员膝关节的有效性;分析在前碰撞载荷下生长板对儿童膝关节的生物力学响应及损伤机制。方法基于儿童生理结构及CT影像构建包含生长板的6岁儿童乘员下肢有限元模型,赋予相应的材料属性;参照Kerrigan等及Haut等的生物力学实验,验证模型的有效性,分析不同生长板材料属性对膝关节损伤的影响。结果通过模型仿真实验与生物力学实验曲线对比验证了模型的有效性;在膝关节区域,生长板的存在可以改变儿童乘员下肢骨折的损伤模式;不同生长板的材料属性,可以影响股骨轴向损伤力的阈值及达到损伤阈值而发生骨折的相对位置。结论所建模型得到有效验证,可用于6儿童乘员膝关节损伤生物力学响应及损伤机制的相关研究及应用。
Objective To construct a finite element model of lower extremity for a 6-year-old child with a higher simulation degree to verify the validity of the 6-year-old child’s knee joint and to analyze the biomechanical response and injury mechanism of the growth plate to a child’s knee under the frontal collision load. Methods Based on the physiological structure of children and CT images, the lower extremity finite element model of 6-year-old children with growth plate was constructed and the corresponding material properties were given. The validity of the model was verified by reference to the Kerrigan et al. And Haut et al. Biomechanical experiments. Effect of Attributes on Knee Injury. Results The validity of the model was verified by comparison between model simulation experiments and biomechanical experimental curves. In the knee joint region, the presence of growth plate can change the injury pattern of lower extremity fracture of children occupant. The material properties of different growth plates may affect axial femoral injury The threshold of force and the relative position of the fractures that reach the damage threshold. Conclusion The validated model can be used to study the biomechanical response and injury mechanism of knee joint injuries in 6 children.