3D-Printed Insole for Measuring Ground Reaction Force and Center of Pressure During Walking

Area of Science:

• Biomechanics
• Biomedical Engineering
• Wearable Technology

Background:

• Ground reaction force (GRF) and center of pressure (COP) are crucial for gait analysis and device control.
• Current measurement methods rely on expensive laboratory equipment like force plates or specialized insoles.
• There is a need for cost-effective, portable solutions for gait analysis outside controlled environments.

Purpose of the Study:

• To develop and validate a novel 3D-printed insole for estimating GRF and COP during walking.
• To create a low-cost alternative to existing commercial instrumented insoles.
• To enable gait analysis in diverse settings, including outside of laboratory conditions.

Main Methods:

• Development of a 3D-printed insole with two pneumatic chambers and pressure sensors.
• Utilizing motion capture data and parameter identification techniques for insole characterization and validation.
• Testing the insole's performance during walking at various speeds.

Main Results:

• The 3D-printed insole demonstrated durability, withstanding loads up to 1.2 times body weight.
• The insole's bandwidth was sufficient for capturing dynamic gait characteristics.
• Estimated GRF and anterior-posterior COP position with a validated error of less than 9%.

Conclusions:

• The developed 3D-printed insole provides a cost-effective and accurate method for estimating GRF and COP.
• This technology facilitates gait analysis outside laboratory settings, overcoming cost barriers of commercial solutions.
• The low-cost solution has potential applications in areas like exoskeleton control and clinical gait assessments.