The impact of unexpected platform perturbation on ankle proprioception ability in static and dynamic starting positions

Steinberg, Nili; Tenenbaum, Galit; Witchalls, Jeremy; Waddington, Gordon

doi:10.1016/j.gaitpost.2022.09.003

Cited by 2 publications

(1 citation statement)

References 38 publications

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“…Active inversion and eversion of the ankle joint are crucial for maintaining balance while walking [23,24]. The exosuit's unexpected non-plantarflexion moment can disrupt natural ankle movements [25][26][27], similar to muscle strength imbalances or less coordination of postural control, which have been found to exhibit a higher incidence of ankle sprains [28,29]. This can be particularly problematic for those who depend on the exosuit to compensate for impaired balance or mobility [30], as it can increase the fear of falling and the incidence of falls [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Assistance Force-line of Exosuit Affects Ankle Multidimensional Motion: A Theoretical and Experimental Study

Zhang

Liu

Sun

2023

Preprint

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Background: The talocrural joint and the subtalar joint are the two major joints of the ankle-joint complex. The position and direction of the exosuit force line relative to these two joint axes can influence ankle motion. We aimed to understand the effects of different force-lines on ankle multidimensional motion. Methods: In this article, three assistance force line schemes for ankle exosuits were proposed: perpendicular to the talocrural joint axis (PT), intersecting with the subtalar joint axis (IS), and parallel to the triceps surae (PTS). A theoretical model was proposed to calculate the exosuit's assistance moment. Seven participants completed four experimental tests of ankle plantar flexion, including three passive motions assisted by the PT, PTS, and IS, and one active motion without exosuit assistance. Results: The simulation results showed that all three exosuit schemes produced considerable ankle plantarflexion moments. Among the three schemes, the PT scheme generated the highest moments in all three dimensions, followed by the PTS and IS schemes. The experimental findings revealed that there was no significant difference in the angle of plantarflexion between passive and active plantarflexion (P < 0.05). However, there was an increase in the average peak angle of ankle inversion and adduction compared to no assistance, with the increment of approximately 21.07°, 6.57°, and 2.41° for inversion and 8.29°, 2.65°, and 0.33° for adduction, respectively. Our study demonstrated that all three exosuit schemes were beneficial for ankle plantar flexion. The IS scheme had the least effect on ankle inversion/eversion and adduction/abduction and was most similar to active ankle plantarflexion in all three directions compared to the other two schemes. Conclusions: Our research indicates that the position of the exosuit force line to the subtalar joint has a significant impact on ankle inversion and adduction. Among all three schemes, the IS, which has almost no effect on the subtalar joint, has the greatest kinematic similarity to active ankle plantarflexion and might be a better choice for ankle assistance and rehabilitation.

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Section: Introductionmentioning

confidence: 99%

Assistance Force-line of Exosuit Affects Ankle Multidimensional Motion: A Theoretical and Experimental Study

Zhang

Liu

Sun

2023

Preprint

View full text Add to dashboard Cite

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Assistance force-line of exosuit affects ankle multidimensional motion: a theoretical and experimental study

Zhang,

Li,

Sun

2024

J NeuroEngineering Rehabil

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Background The talocrural joint and the subtalar joint are the two major joints of the ankle-joint complex. The position and direction of the exosuit force line relative to these two joint axes can influence ankle motion. We aimed to understand the effects of different force-lines on ankle multidimensional motion. Methods In this article, three assistance force line schemes for ankle exosuits were proposed: perpendicular to the talocrural joint axis (PT), intersecting with the subtalar joint axis (IS), and parallel to the triceps surae (PTS). A theoretical model was proposed to calculate the exosuit’s assistance moment. Seven participants completed four experimental tests of ankle plantarflexion, including three passive motions assisted by the PT, PTS and IS schemes, and one active motion without exosuit assistance (Active). Results The simulation results demonstrated that all three exosuits were able to produce significant moments of ankle plantarflexion. Among these, the PT scheme exhibited the highest moments in all dimensions, followed by the PTS and IS schemes. The experimental findings confirmed the effectiveness of all three exosuit schemes in assisting ankle plantarflexion. Additionally, as the assistive force lines approached the subtalar joint, there was a decrease in ankle motion assisted by the exosuits in non-plantarflexion directions, along with a reduction in the average distance of ankle angle curves relative to active ankle motion. Furthermore, the linear correlation coefficients between inversion and plantarflexion, adduction and plantarflexion, and adduction and inversion gradually converged toward active ankle plantarflexion motion. Conclusions Our research indicates that the position of the exosuit force line to the subtalar joint has a significant impact on ankle inversion and adduction. Among all three schemes, the IS, which has the closest distance to the subtalar joint axes, has the greatest kinematic similarity to active ankle plantarflexion and might be a better choice for ankle assistance and rehabilitation.

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The impact of unexpected platform perturbation on ankle proprioception ability in static and dynamic starting positions

Cited by 2 publications

References 38 publications

Assistance Force-line of Exosuit Affects Ankle Multidimensional Motion: A Theoretical and Experimental Study

Assistance Force-line of Exosuit Affects Ankle Multidimensional Motion: A Theoretical and Experimental Study

Assistance force-line of exosuit affects ankle multidimensional motion: a theoretical and experimental study

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