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Updated: Nov 26, 2025
Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
Published on: July 22, 2014
Design and Validation of a Powered Knee-Ankle Prosthesis with High-Torque, Low-Impedance Actuators
Toby Elery1, Siavash Rezazadeh1, Christopher Nesler1
1T. Elery is with the Departments of Bioengineering and Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080 USA. S. Rezazadeh is with the Department of Mechanical Engineering, University of Denver, Denver, CO, 80208 USA. C. Nesler and R. D. Gregg are with the Department of Electrical Engineering and Computer Science; Robotics Institute, University of Michigan, Ann Arbor, MI, 48109 USA.
This study introduces a novel powered prosthetic leg with a unique actuator design, offering improved free-swinging motion, ground compliance, and reduced noise and power consumption for advanced robotic prosthetics.
Area of Science:
- Robotics
- Biomechanics
- Prosthetics
Background:
- Modern robotic prosthetic legs often face challenges with actuator limitations.
- High mechanical impedance and complex dynamics hinder natural movement and efficiency.
Purpose of the Study:
- To design and evaluate a powered knee-ankle prosthetic leg utilizing novel high-torque actuators.
- To demonstrate the benefits of low mechanical impedance and high backdrivability in prosthetic actuation.
Main Methods:
- Implementation of high-torque actuators with low-reduction transmissions and low-speed motors.
- Conducting benchtop tests for backdrivability and inertia measurements.
- Performing impedance control tests and walking experiments to validate performance.
Main Results:
- Actuators demonstrated low mechanical impedance and high backdrivability, enabling free-swinging motion.
- Successful impedance control without torque feedback, validated by walking experiments.
- Reduced power consumption and acoustic noise compared to existing powered prosthetic legs.
Conclusions:
- The proposed actuator design offers significant advantages for robotic prosthetic legs.
- This technology enhances natural gait, user comfort, and energy efficiency.
- Further development could lead to more advanced and user-friendly prosthetic devices.
