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Published on: May 8, 2014
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A Data-Driven and Personalized Stance Symmetry Controller for Robotic Ankle-Foot Prostheses: A Preliminary
Summary
This study introduces a personalized robotic ankle-foot prosthesis controller that improves gait symmetry for amputees. The data-driven approach enhances ankle function, reducing long-term musculoskeletal issues and improving mobility.
Area of Science:
- Biomedical Engineering
- Rehabilitation Robotics
- Gait Biomechanics
Background:
- Unilateral transtibial amputation often leads to asymmetric gait due to limitations in current prosthetic ankle function.
- This asymmetry can cause compensatory movements, increasing the risk of musculoskeletal impairments like osteoarthritis in the intact limb.
- Existing powered prostheses rely on generalized data and extensive expert tuning, failing to adapt to individual gait patterns.
Purpose of the Study:
- To develop and evaluate a personalized, data-driven control strategy for robotic ankle-foot prostheses.
- To enhance gait symmetry and reduce compensatory behaviors in individuals with transtibial amputation.
- To improve the functional performance of powered prostheses by adapting to unique user gait patterns.
Main Methods:
- A novel controller was designed using a virtual setpoint trajectory within an impedance-inspired framework to adjust prosthesis dynamics.
- Real-time gait phase estimation was achieved using a single thigh motion sensor.
- A data-driven iterative learning strategy optimized the virtual setpoint trajectory to improve ankle angle symmetry.
Main Results:
- Experimental evaluation on two participants with transtibial amputation demonstrated a 24.4% increase in ankle angle symmetry compared to passive conditions.
- The symmetry controller significantly increased peak prosthetic ankle power output at push-off (0.52 W/kg).
- Biomechanical risk factors for osteoarthritis, specifically knee and hip abduction moments in the intact limb, were significantly reduced.
Conclusions:
- Personalized, data-driven symmetry controllers offer significant benefits for robotic ankle-foot prostheses.
- This approach enhances gait symmetry, improves prosthetic function, and mitigates secondary musculoskeletal impairments.
- The developed control strategy represents a promising advancement in prosthetic limb technology for amputees.
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