基于CT图像马拉松运动员步态周期中髋关节应力分布的有限元分析  

Finite element analysis of hip joint stress distribution based on CT imaging in marathon runners during the gait cycle

作　　者：陈诺 邱丽华[1] 常晓丹[2] Chen Nuo;Qiu Lihua;Chang Xiaodan(Medical Imaging Center,the Second People's Hospital of Yibin,Yibin 644000,China;Department of Radiology,Zhongshan Hospital,Dalian University,Dalian 116000,China)

机构地区：[1]宜宾市第二人民医院医学影像中心,宜宾644000 [2]大连大学附属中山医院放射科,大连116000

出　　处：《中华放射学杂志》2023年第12期1305-1311,共7页Chinese Journal of Radiology

摘　　要：目的运用有限元分析方法探讨马拉松运动员与正常志愿者髋关节周围应力在步态周期中的基本分布情况。方法于2022年11月采集1名男性马拉松运动员和1名男性健康志愿者髋关节CT图像数据,选取日常步态周期中7个时相(足跟着地、单足支撑早期、单足支撑中期、单足支撑晚期、足尖蹬伸期、摆动初期及摆动末期),基于CT灰度值按个体化材料属性赋值方案构建三维有限元模型,以步态周期中髋关节接触力的动态变化施加载荷,通过等效应力结果进行模型生物力学定性分析,在定性分析基础上分别提取模型髋臼前部、中部、后部和股骨头前部、后部、股骨颈部表面相同的10个节点作为等效应力参考点,进行模型生物力学定量分析。结果在步态周期中,从髋关节等效应力分布图看,2名受试者关节面上的接触主要发生在髋臼后上部和股骨头后部,且在步行过程中随关节合力逐渐向外向后移动。从髋关节周围应力分布节点看,2名受试者各部位节点的应力变化与各时相髋关节内部的载荷情况均具有双峰性,从足跟着地开始髋关节内部应力值呈逐渐上升趋势,在单脚支撑中期达到最大应力,随后降低,在足尖蹬伸期略微上升,而后在摆动初期与末期应力值均呈逐渐下降趋势,直至进入下个步态周期。马拉松运动员在髋臼后部与股骨头后部的应力值均小于志愿者。结论马拉松运动员与正常志愿者在步态运动中髋关节周围应力大小存在差异,但都呈现一致的应力分布及传递路径。Objective To explore the distribution of perihip stress in male marathon runners and normal volunteers during the gait cycle using finite element analysis.Methods In November 2022,the hip joint CT image data of a male marathon runner and a male healthy volunteer was collected.The gait cycle was divided into 7 phases,including the foot to the ground,the early,middle,and late period of one-foot support,the toe push and extension period,and the beginning and end of the swing.A three-dimensional finite element model was constructed based on the gray value of CT and according to the individualized material attribute assigning scheme.The dynamic change of hip joint contact force during the gait cycle was applied to the load,and the biomechanical qualitative analysis of the model was carried out through the equivalent stress results.Based on qualitative analysis,the same 10 nodes on the front,middle,and back of the model acetabulum,the front,and back of the femoral head,and the neck of the femur were extracted as equivalent stress reference points,and the biomechanical quantitative analysis of the model was carried out.Results During the gait cycle,according to the hip equivalent stress distribution diagram,the contact on the articular surface of the two subjects mainly occurred in the posterior upper part of the acetabulum and the posterior part of the femoral head and gradually moved outward and backward with the joint force during walking.From the point of view of the stress distribution nodes around the hip joint,the stress changes of the nodes in each part of the two subjects showed bimodal characteristics with the load inside the hip joint at each phase.The internal stress value of the hip joint showed a gradual upward trend from the foot to the ground,reached the maximum stress in the middle period of one-foot support,then decreased,and slightly increased in the toe push and extension period.Then,the stress values at the beginning and end of the swing gradually decreased until entering the next gait cycle.The str

关 键 词：体层摄影术 X线计算机 髋关节 马拉松 有限元分析 步态 运动医学 生物力学 

分 类 号：R87[医药卫生—运动医学] R445.2[医药卫生—临床医学]