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Powered knee exoskeleton improves sit-to-stand transitions in stroke patients using electromyographic control
Andrew J Gunnell1,2,3, Sergei V Sarkisian1,2,3, Heather A Hayes4
1Department of Mechanical Engineering at the University of Utah, Salt Lake City, UT, USA.
Communications Engineering
|June 7, 2025
Summary
Powered knee exoskeletons help stroke survivors with hemiparesis stand up more easily. This assistive technology improves speed, symmetry, and reduces effort, enhancing mobility and quality of life.
Area of Science:
- Rehabilitation Engineering
- Biomechanics
- Neuroscience
Background:
- Hemiparesis, common after stroke, significantly impairs daily activities and independence.
- Difficulty standing from a seated position is a major challenge for stroke survivors.
Purpose of the Study:
- To evaluate the effectiveness of a powered knee exoskeleton in improving the ability to stand up for stroke survivors with hemiparesis.
Main Methods:
- A powered knee exoskeleton with proportional electromyographic control was used.
- Eight stroke survivors with hemiparesis participated in the study.
- Key metrics included stand-up time, weight-bearing symmetry, and muscle activation.
Main Results:
- Stroke survivors demonstrated an 8.8% reduction in stand-up time.
- Weight-bearing symmetry increased by 13.7% with exoskeleton use.
- Peak quadriceps activation decreased by 32%, and peak biological torque generation by 25%.
Conclusions:
- Powered knee exoskeletons significantly enhance stand-up ability in stroke survivors.
- The technology improves movement symmetry and reduces muscular effort.
- Exoskeletons offer a promising avenue for improving mobility and quality of life for individuals with hemiparesis.
