摘要
目的:探讨扁平足步态支撑期特征与下肢肌力间的关系。方法:招募20名受试者,通过足弓高度指数将受试者划分为正常足组(n=10)和扁平足组(n=10)。采用步态测试和OpenSim模拟仿真,对两种足型受试者的步态周期运动学参数、支撑期地面反作用力和踝周肌群肌力进行对比分析。结果:扁平足行走时支撑期占比和足跟离地时间高于正常足(P<0.05),踝关节在步态过程中表现出过度外翻(P<0.05);着地时髋膝关节屈曲角度高于正常足(P<0.05);扁平足支撑期地面反作用力两峰值F1和F3相对值低于正常足(P<0.05);扁平足步态支撑期胫骨前肌、胫骨后肌、腓肠肌、腓骨长肌、腓骨短肌、趾长屈肌、拇长屈肌最大肌力小于正常足(P<0.05)。结论:OpenSim能够较好地模拟扁平足步态特征,扁平足通过着地时更大的髋膝屈曲角度来弥补踝背屈肌群肌力较弱造成的缓冲震荡能力不足。其较低的足弓使胫骨后肌、趾长屈肌、拇长屈肌在支撑中期具有较高的激活程度。扁平足比目鱼肌在蹬伸阶段表现出比正常足更高的推进贡献率,但整体推进能力仍低于正常足。
Objective To study the relationship between the gait characteristics and lower-limb muscle strength in the stance period of patients with flat feet.Methods Twenty subjects were recruited and randomly divided into a normal foot group(n=10)and a flat foot group(n=10)according to their arch height index.Gait test and OpenSim simulation were used to compare and analyze the kinematic parameters of the gait cycle,ground reaction force during the supporting period and peri-ankle muscle strength.Results In walking,the proportion of the support period and the time of heel off the ground of the flat foot group were significantly higher than the normal feet group(P<0.05),and the ankle joints were of excessive eversion(P<0.05).Moreover,the flexion angles of the hip and knee on landing were significantly higher than the normal foot group(P<0.05),and the relative values of F1 and F3 at the peak of ground reaction force were significantly lower than the latter group(P<0.05).Meanwhile,the maximum muscle strength of the tibialis anterior muscle,tibialis posterior muscle,gastrocnemius muscle,peroneus longus,peroneus brevis,flexor toe longus and flexor hallucis longus was smaller than the normal foot group in the gait support period(P<0.05).Conclusions OpenSim can well simulate the gait characteristics of flat feet,which make up for the weak strength of the dorsiflexor of the ankle to cushion the shock through the larger hip and knee flexion angles when landing.The lower arch of the foot results in higher activation of the tibialis posterior,flexor toe longus,and flexor hallucis longus during the metaphase of support.The soleus muscle of flat feet displays a higher contribution rate of propulsion than that of normal feet in the push and extension stage,but the overall propulsion capacity is still lower than the latter.
作者
赵虎
马晓子
霍洪峰
李晓璨
刘鑫玥
魏佳琳
Zhao Hu;Ma Xiaozi;Huo Hongfeng;Li Xiaocan;Liu Xinyue;Wei Jialin(Hebei Normal University,Physical Culture Institute,Shijiazhuang 050024,China;Hebei Provincial Key Lab of Measurement and Evaluation in Human Movement and Bioinformation,Shijiazhuang 050024,China)
出处
《中国运动医学杂志》
CAS
CSCD
北大核心
2023年第2期93-101,共9页
Chinese Journal of Sports Medicine
基金
河北省科技支撑项目(16275709)
河北省专业学位研究生教学案例建设项目(KCJSZ2020031)
