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A prototype wireless inertial-sensing device for measuring toe clearance.

Daniel T H Lai¹, E Charry, R Begg

¹Centre for Ageing, Rehabilitation, Exercise and Sport, Victoria University, Vic 8001, Australia. daniel.lai@vu.edu.au

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 24, 2009

Summary

This study presents a wireless device for monitoring minimum toe clearance (MTC), a key indicator of fall risk in the elderly. The prototype shows reliable performance, paving the way for remote fall prevention strategies.

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Area of Science:

Biomechanics
Gerontology
Wearable Technology

Background:

Falls in the elderly are a major health concern, leading to severe injuries and high medical costs.
Minimum toe clearance (MTC) is a sensitive predictor of fall risk, but traditional measurement methods are lab-bound.
Developing accessible methods for MTC monitoring is crucial for proactive fall prevention.

Purpose of the Study:

To design and prototype a wireless device for monitoring vertical toe clearance.
To evaluate the device's performance in various conditions and compare it with existing motion systems.
To assess the feasibility of using wearable sensors for real-world fall risk assessment.

Main Methods:

A wireless sensing prototype integrating a tri-axis accelerometer and dual-axis gyroscope was developed.
Data were transmitted wirelessly using Crossbow sensor motes to a laptop with a Matlab GUI.
Experiments included zero base and treadmill walking, with comparisons against an Optotrak motion system.

Main Results:

The device demonstrated approximate independence from small ambient temperature variations.
Reliable wireless transmission range was observed up to 20m indoors and 50m outdoors.
Toe clearance measurements correlated with the Optotrak system, though improvements for integration errors and transmission rates are noted.

Conclusions:

The developed wireless device shows promise for monitoring minimum toe clearance outside controlled laboratory settings.
The prototype's performance suggests potential for remote, continuous fall risk assessment in the elderly.
Further refinement of the system could enhance accuracy and data transmission for practical clinical application.