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A simple instrumented insole algorithm to estimate plantar flexion moments.
Todd J Hullfish1, Josh R Baxter1
1Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA.
Gait & Posture
|May 11, 2020
Summary
This study developed a method to measure plantar flexion moment using an instrumented insole. The results show this wearable technology accurately estimates loading during various activities, aiding in clinical applications.
Area of Science:
- Biomechanics
- Wearable Technology
- Gait Analysis
Background:
- Plantar flexion is crucial for walking and running.
- Limited wearable devices exist to monitor plantar flexion loading accurately.
Purpose of the Study:
- To develop and validate a method for calculating plantar flexion moment.
- Utilize a commercially available instrumented insole for this purpose.
Main Methods:
- Healthy adults performed functional activities (walking, running, jumping).
- Motion capture and instrumented insoles recorded lower extremity movement and forces.
- Plantar flexion moment from insoles was compared to inverse dynamics (gold standard).
Main Results:
- Insole method accurately estimated plantar flexion moment across activities.
- Maximum moment errors were below 10%, averaging 4.9%.
- Waveforms showed strong correlation (Rxy > 0.964) with inverse dynamics.
Conclusions:
- A simple, validated method for estimating plantar flexion moment using instrumented insoles is presented.
- This technology enables tracking and prescribing plantar flexion loading outside clinical settings.
- Improved patient outcomes are anticipated through better loading management.
