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Related Experiment Video

Updated: Jul 29, 2025

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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Development of an Integrated Powered Hip and Microprocessor-Controlled Knee for a Hip-Knee-Ankle-Foot Prosthesis.

Yousef Bader1, David Langlois2, Natalie Baddour1

  • 1Department of Mechanical Engineering, University of Ottawa, 800 King Edward Ave., Ottawa, ON K1N 6N5, Canada.

Bioengineering (Basel, Switzerland)
|May 27, 2023
PubMed
Summary

A new integrated hip-knee (IHK) unit for hip amputees improves mobility. This novel prosthetic design shows promise in early testing, offering a potential solution to high rejection rates and gait issues associated with traditional hip-knee-ankle-foot prostheses.

Keywords:
hip amputationhip–knee–ankle–foot prosthesisintegrated hip kneemicroprocessor-controlled prosthesispowered hip

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Rehabilitation Engineering

Background:

  • Hip-knee-ankle-foot prostheses (HKAF) are crucial for mobility in hip amputees but often face high user rejection rates.
  • Existing HKAFs can lead to gait asymmetry, increased trunk lean, and pelvic tilt, impacting user function and comfort.

Purpose of the Study:

  • To design and evaluate a novel integrated hip-knee (IHK) unit to overcome the limitations of current HKAFs.
  • To combine powered hip and microprocessor-controlled knee joints into a single, adjustable unit.

Main Methods:

  • Mechanical proof load testing according to ISO-10328:2016 standard for structural safety.
  • Functional testing with able-bodied participants using a hip prosthesis simulator.
  • Analysis of hip, knee, and pelvic tilt angles, and stride parameters from video recordings.

Main Results:

  • ISO-10328:2016 testing confirmed acceptable structural safety and rigidity of the IHK unit.
  • Participants successfully walked independently using the IHK, demonstrating its functional capability.
  • Analysis revealed distinct walking strategies employed by participants using the IHK.

Conclusions:

  • The novel integrated hip-knee unit demonstrates potential for improving mobility and addressing limitations of conventional HKAFs.
  • Further development, including a synergistic gait control system and amputee user testing, is recommended.