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Swing phase considerations in prosthetic knee design: Case series to validate simulations
S Sudeesh1, M S Shunmugam2, R Ojha3
1Master of Technology in Mechatronics Engineering, Department of Mechanical Engineering, IIT Madras, Chennai, India.
Prosthetics and Orthotics International
|April 12, 2022
Summary
The new polycentric knee (IPK) simplifies prosthetic design by eliminating the need for an extension assist, improving swing phase performance. Gait trials validated simulation findings, though socket adapter placement requires adjustment for optimal stability and clearance.
Area of Science:
- Biomedical Engineering
- Prosthetics and Orthotics
- Gait Analysis
Background:
- Simulations suggested polycentric knees improve swing phase and negate extension assist needs.
- Anterior socket adapters enhance stability but compromise foot clearance.
Purpose of the Study:
- Validate simulation findings with gait trials.
- Inform further improvements in the IPK design before production.
Main Methods:
- Gait trials with three subjects using various passive knees.
- Comparison of subjects' regular prostheses with the IPK (no extension assist).
- Correlation of gait trial data with prior simulation results.
Main Results:
- IPK's swing performance obviated the need for extension assist.
- Anterior socket adapter in IPK necessitated compensatory strategies for foot clearance.
- IPK demonstrated superior knee extension and reduced hip effort (up to 42%).
Conclusions:
- Gait trials confirmed IPK's swing phase behavior from simulations.
- IPK design simplification achieved by removing extension assist.
- IPK socket adapter location needs refinement for stability and clearance.
