偏瘫患者步态特征的动力学仿真分析  

Dynamic simulation analysis on gait features of hemiplegic patients

作　　者：束一铭 钱竞光[2] 戎科[3] 冯雷[3] 李兆霞[1] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]南京体育学院科研处,南京210014 [3]南京体育学院健康系,南京210014

出　　处：《医用生物力学》2017年第6期535-540,共6页Journal of Medical Biomechanics

基　　金：国家自然科学基金项目(31270998)

摘　　要：目的研究偏瘫步态特征与下肢异常肌力之间的内在关系,阐明导致偏瘫步态的肌力原因并为临床治疗提供建议。方法以偏瘫步态和正常步态为研究对象进行建模仿真,通过正常步态下仿真模型与实测数据对比验证模型有效性,对两种模型的运动学数据、地面反作用力(ground reaction force,GRF)及肌力等特征曲线进行差异分析。结果 LifeMOD仿真结果与测力台实测GRF曲线复相关系数为0.922,动力学模型合理有效。偏瘫步态患者初始着地期胫前肌肌力小导致踝关节背屈不足,摆动前期腓肠肌肌力小,起不到蹬离推动作用。结论胫前肌、腓肠肌软弱无力是偏瘫患者出现足下垂等偏瘫步态特征的主要原因,LifeMOD建模仿真可协助诊断偏瘫患者的异常肌力。Objective To study the intrinsic relationship between hemiplegic gait features and abnormal muscle strength of lower limbs,so as to elucidate the muscle strength causes of hemiplegic gait and provide recommendations for its clinical treatment. Methods Models of hemiplegic gait and normal gait were established for simulation,and the validity of the models was verified by comparing the simulation model with measured data of the normal gait. The differences in kinetic data,ground reaction force（ GRF） and muscle force between the two models were analyzed to explore the different dynamic characteristic of hemiplegic gait and normal gait. Results The complex correlation coefficient between Life MOD simulation results and measured data was 0. 922,indicating that the established dynamic model was reasonable and effective. Hemiplegic patient with low tibialis anterior muscle strength led to ankle dorsiflexion inadequacy during initial ground period,and low gastrocnemius muscle could not achieve the promoting effect from ground during preswing period. Conclusions The strength weakness of tibialis anterior muscle and gastrocnemius are the main reasons for foot drooping and other hemiplegic gait characteristics. Life MOD modeling and simulation can assist the diagnosis of abnormal muscle strength in hemiplegia patients.

关 键 词：偏瘫步态 LifeMOD软件 多体动力学 运动生物力学 

分 类 号：R318.01[医药卫生—生物医学工程]