Cable-routing geometry alone in a single-actuator hip exosuit can shape phase-localized hip kinematics, reaching significance in the transverse plane, but effects were small and near measurement uncertainty, so routing geometry is proposed as a candidate rather than an established design variable.
Multi-plane cable routing with flexion assistance increased hip internal rotation relative to unassisted walking.
Multi-plane cable routing with extension assistance increased hip external rotation relative to unassisted walking.
Single-plane flexion assistance produced a smaller but significant increase in hip external rotation relative to unassisted walking.
The hypothesis that multi-plane routing would produce larger frontal-plane deviations was not supported.
Multi-plane routing produced greater sagittal-plane hip excursion than single-plane routing.
Overall gait-trajectory similarity between single-plane and multi-plane routing was comparable in most comparisons, differing significantly only in the hip frontal plane during extension assistance.
Estimated exosuit torques showed multi-plane routing introduced larger frontal- and transverse-plane components while the sagittal-plane component remained dominant.
The kinematic effects were small, near the measurement uncertainty of the motion capture system, and the sample limits generalizability.
This study asked whether simply changing how the cables are routed around the hip in a soft, wearable walking-assist suit (a 'soft exosuit') could make it influence hip motion in more than one direction, without adding extra motors. Ten healthy men experienced with exosuits walked on a treadmill with no power and with four powered setups that combined straight (single-plane) or angled (multi-plane) cable routing with help for either lifting the leg forward or pushing it backward. The angled routing changed how the hip rotated, mainly twisting inward or outward, by roughly 2 to 4 degrees at certain points in the stride. It did not significantly change side-to-side hip motion compared with walking without assistance, which the researchers had expected it might. The main forward-backward pull remained the dominant force even with angled routing, though angled routing added more sideways and twisting force components. The changes were small and close to the measurement error of the motion-capture system, and the group was small, all male, and already used to exosuits. This research suggests cable routing may be a way to add multi-directional effects to simple exosuits, but it remains an idea to test, including in people with walking impairments, rather than a proven design approach.
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Upload Your LabsKwon J, Park S, Driscoll H, Lee G. (2026). Cable-routing geometry as a design variable for multiplanar hip assistance in a single-actuator soft exosuit.. PloS one. https://doi.org/10.1371/journal.pone.0359731