{"title":"在步行过程中,横跨距骨和距下关节的电缆驱动辅助对踝关节复合体的反应如何?","authors":"Xinyue Zhang;Ronglei Sun","doi":"10.1109/TNSRE.2025.3605818","DOIUrl":null,"url":null,"abstract":"Cable-driven ankle exoskeletons are primarily designed to assist plantarflexion, but their actuation cables also span the subtalar joint, potentially producing unintended inversion–eversion torques. These unintended torques can affect frontal-plane kinematics, joint coordination, gait stability, and assistance efficiency. This study investigated how the ankle complex responds to multidimensional assistance torques during walking. To this end, we established an assistive torque model based on anatomical joint axes and developed a dual-cable-driven ankle exoskeleton for evaluation. Four assistance modes were examined: three single-cable modes applying force from medial (Med), central (Mid), or lateral (Lat) heel positions, and a dual-cable biomimetic (Bionic) mode replicating physiological torque distribution. Six healthy participants performed treadmill walking trials in each mode, with multiple biomechanical and physiological variables recorded. Simulation and experimental results showed that the Lat mode generated eversion moments, increased eversion, shifted the center of pressure (CoP) medially, and reduced mediolateral center-of-mass sway by 9% compared with unassisted walking, thereby improving stability. The Med and Mid modes induced inversion moments, increased inversion, and shifted the CoP laterally, with Med producing the strongest effect. Compared with the other modes, the Bionic mode achieved the greatest reduction in muscle activation relative to unassisted walking, lowering soleus EMG by 10% and that of the ankle inversion muscle group and peroneus brevis by 18–22%, while best preserving ankle coordination patterns. These findings highlight the importance of frontal-plane dynamics in ankle exoskeleton control and the benefits of biomimetic torque distribution in preserving coordination and reducing locomotor effort in assisted walking.","PeriodicalId":13419,"journal":{"name":"IEEE Transactions on Neural Systems and Rehabilitation Engineering","volume":"33 ","pages":"3605-3615"},"PeriodicalIF":5.2000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11150492","citationCount":"0","resultStr":"{\"title\":\"How Does the Ankle Complex Respond to Cable-Driven Assistance Spanning the Talocrural and Subtalar Joints During Walking?\",\"authors\":\"Xinyue Zhang;Ronglei Sun\",\"doi\":\"10.1109/TNSRE.2025.3605818\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Cable-driven ankle exoskeletons are primarily designed to assist plantarflexion, but their actuation cables also span the subtalar joint, potentially producing unintended inversion–eversion torques. These unintended torques can affect frontal-plane kinematics, joint coordination, gait stability, and assistance efficiency. This study investigated how the ankle complex responds to multidimensional assistance torques during walking. To this end, we established an assistive torque model based on anatomical joint axes and developed a dual-cable-driven ankle exoskeleton for evaluation. Four assistance modes were examined: three single-cable modes applying force from medial (Med), central (Mid), or lateral (Lat) heel positions, and a dual-cable biomimetic (Bionic) mode replicating physiological torque distribution. Six healthy participants performed treadmill walking trials in each mode, with multiple biomechanical and physiological variables recorded. Simulation and experimental results showed that the Lat mode generated eversion moments, increased eversion, shifted the center of pressure (CoP) medially, and reduced mediolateral center-of-mass sway by 9% compared with unassisted walking, thereby improving stability. The Med and Mid modes induced inversion moments, increased inversion, and shifted the CoP laterally, with Med producing the strongest effect. Compared with the other modes, the Bionic mode achieved the greatest reduction in muscle activation relative to unassisted walking, lowering soleus EMG by 10% and that of the ankle inversion muscle group and peroneus brevis by 18–22%, while best preserving ankle coordination patterns. These findings highlight the importance of frontal-plane dynamics in ankle exoskeleton control and the benefits of biomimetic torque distribution in preserving coordination and reducing locomotor effort in assisted walking.\",\"PeriodicalId\":13419,\"journal\":{\"name\":\"IEEE Transactions on Neural Systems and Rehabilitation Engineering\",\"volume\":\"33 \",\"pages\":\"3605-3615\"},\"PeriodicalIF\":5.2000,\"publicationDate\":\"2025-09-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11150492\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Transactions on Neural Systems and Rehabilitation Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/11150492/\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, BIOMEDICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Neural Systems and Rehabilitation Engineering","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/11150492/","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, BIOMEDICAL","Score":null,"Total":0}
How Does the Ankle Complex Respond to Cable-Driven Assistance Spanning the Talocrural and Subtalar Joints During Walking?
Cable-driven ankle exoskeletons are primarily designed to assist plantarflexion, but their actuation cables also span the subtalar joint, potentially producing unintended inversion–eversion torques. These unintended torques can affect frontal-plane kinematics, joint coordination, gait stability, and assistance efficiency. This study investigated how the ankle complex responds to multidimensional assistance torques during walking. To this end, we established an assistive torque model based on anatomical joint axes and developed a dual-cable-driven ankle exoskeleton for evaluation. Four assistance modes were examined: three single-cable modes applying force from medial (Med), central (Mid), or lateral (Lat) heel positions, and a dual-cable biomimetic (Bionic) mode replicating physiological torque distribution. Six healthy participants performed treadmill walking trials in each mode, with multiple biomechanical and physiological variables recorded. Simulation and experimental results showed that the Lat mode generated eversion moments, increased eversion, shifted the center of pressure (CoP) medially, and reduced mediolateral center-of-mass sway by 9% compared with unassisted walking, thereby improving stability. The Med and Mid modes induced inversion moments, increased inversion, and shifted the CoP laterally, with Med producing the strongest effect. Compared with the other modes, the Bionic mode achieved the greatest reduction in muscle activation relative to unassisted walking, lowering soleus EMG by 10% and that of the ankle inversion muscle group and peroneus brevis by 18–22%, while best preserving ankle coordination patterns. These findings highlight the importance of frontal-plane dynamics in ankle exoskeleton control and the benefits of biomimetic torque distribution in preserving coordination and reducing locomotor effort in assisted walking.
期刊介绍:
Rehabilitative and neural aspects of biomedical engineering, including functional electrical stimulation, acoustic dynamics, human performance measurement and analysis, nerve stimulation, electromyography, motor control and stimulation; and hardware and software applications for rehabilitation engineering and assistive devices.