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Ankle Joint

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Home-Based Monitor for Gait and Activity Analysis

Home-Based Monitor for Gait and Activity Analysis

Published on: August 8, 2019

A Wearable Device for Accurate Ankle Movement Evaluation.

Mykola Mazur, George P Kontoudis, Anthony Petrella

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

|December 3, 2025

Summary

This summary is machine-generated.

This study presents an accurate sensor platform for monitoring lower extremity movement, aiding in smart ankle brace development and rehabilitation. The system achieves a measurement error of 2.43° ±0.27° for ankle rotation angles.

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Area of Science:

Biomechanics
Medical Devices
Robotics

Background:

Accurate monitoring of distal lower extremity movement is crucial for developing smart ankle braces and guiding ankle joint rehabilitation.
Existing methods may lack the precision required for detailed anatomical and functional assessments.

Purpose of the Study:

To design and validate an accurate sensor platform for distal lower extremity movement monitoring.
To facilitate the development of subject-specific smart ankle braces and rehabilitation protocols.

Main Methods:

A two-device system was developed: a 3D scanning apparatus for creating subject-specific anatomical models and a sensor platform with two Inertial Measurement Units (IMUs) and a Micro-Controller Unit (MCU).
The 3D model guided the placement of IMUs on the tibia (reference) and intermediate cuneiform (moving frame) for ankle rotation monitoring.
Data was wirelessly streamed to MATLAB for formatting into OpenSim's OpenSense module.

Main Results:

The 3D scanning apparatus achieved an accuracy of 0.5 mm for anatomical modeling.
The sensor platform demonstrated a measurement error of 2.43° ±0.27° for ankle rotation angles across multiple trials.
A peak-to-peak mean angle measurement error of 0.728° was recorded.

Conclusions:

The developed sensor platform provides accurate and efficient data collection for distal lower extremity movement.
This technology holds potential for advancing ankle rehabilitation strategies and the creation of intelligent wearable devices.