人体膝关节力学模型构建和屈曲运动力学特征研究

发布时间：2018-11-08 09:33

【摘要】：目的:构建人体膝关节力学模型和屈曲运动力学特征。方法:将受试者CT扫描图片导入Mim-ics 10.1建模软件中,将处理后的CT图片导入有限元网格划分软件Hyper Meh中完成网格划分,获取有限元模型。结果:采用所构建膝关节三维有限元模型得到的仿真曲线与碰撞实验结果曲线基本一致。在0°~90°区间内,前交叉韧带张力随膝关节屈曲角度的逐渐增加呈下降趋势,后交叉韧带张力随膝关节屈曲角度的逐渐增加呈上升趋势,但上升幅度较小,且二者之间不存在交点。在膝关节屈曲过程中,髌骨受到的压力随膝关节屈曲角度的增大呈上升趋势,在屈曲为90°时达到最大值。内侧半月板剪切应力峰值出现在中后部,约为3.34 MPa,挤压应力峰值出现在后部,约3.02 MPa,接触压峰值出现在后部,约为3.6 MPa;外侧半月板剪切应力峰值出现在前角,约为2.92 MPa,挤压应力峰值在前角,约2.77MPa,接触压峰值出现在前部,约为3.17 MPa。股骨软骨剪切应力峰值在内侧髁软骨处,约为1.85 MPa,挤压应力峰值在内侧髁处,约2.33 MPa,接触压峰值在外侧髁软骨处,约为2.83 MPa。结论:所构建模型能为研究膝关节屈曲运动力学特征提供可靠的有限元模型。
[Abstract]:Objective: to construct a mechanical model of human knee joint and the mechanical characteristics of flexion motion. Methods: the subjects'CT images were imported into the Mim-ics 10.1 modeling software, and the processed CT images were imported into the finite element meshing software Hyper Meh to complete the mesh generation and obtain the finite element model. Results: the simulation curve obtained by using the three-dimensional finite element model of knee joint was basically consistent with the result of collision experiment. In the range of 0 掳~ 90 掳, the tension of anterior cruciate ligament decreased with the increase of knee flexion angle, and the tension of posterior cruciate ligament increased with the angle of knee joint flexion. In the process of knee flexion, the pressure of patella increased with the increase of knee flexion angle, and reached the maximum value when flexion was 90 掳. The peak value of shear stress of medial meniscus appeared in the posterior part of the medial meniscus, about 3.34 MPa, extrusion stress peak appeared in the posterior part, and about 3.02 MPa, contact pressure peak appeared in the posterior part, about 3.6 MPa;. The peak value of shear stress of lateral meniscus appeared in the anterior corner, about 2.92 MPa, extrusion stress peak in the anterior corner, about 2.77 MPA, and the contact pressure peak appeared in the front part, about 3.17 MPa.. The peak value of shear stress of femoral cartilage was at the medial condylar cartilage, about 1.85 MPa, compressive stress was at the medial condyle, and about 2.33 MPa, contact pressure was at the lateral condylar cartilage, about 2.83 MPa.. Conclusion: the established model can provide a reliable finite element model for studying the kinematic characteristics of knee joint buckling.
【作者单位】：天津城建大学体育部;
【分类号】：G804.2

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