Portable Motion-Analysis Device for Upper-Limb Research, Assessment, and Rehabilitation in Non-Laboratory Settings

Area of Science:

• Rehabilitation Engineering
• Biomechanics
• Human-Computer Interaction

Background:

• Quantitative assessment of upper-limb motor function is crucial for diagnosing and managing movement disorders.
• Conventional motion-analysis systems are often complex, expensive, and limited to laboratory settings, hindering their use in clinical and home environments.
• There is a need for portable, low-cost, and user-friendly devices for real-time motor function assessment and rehabilitation.

Purpose of the Study:

• To design and evaluate the feasibility of an interactive, portable motion-analysis device for assessing upper-limb motor functions.
• To develop a system capable of quantitative kinematic measurements for activities of daily living (ADLs).
• To provide a tool that can be used in both clinical and home settings to enhance physical therapy and patient motivation.

Main Methods:

• Development of a portable system using a magnetic table, a 3D-printed cup with an adjustable magnet, and targets for task execution.
• Real-time kinematic tracking of the cup and an internal ball using a single video camera and a custom color-based computer-vision algorithm on a portable computer.
• Preliminary verification of kinematic measurement accuracy using marker-based 3D-motion capture.

Main Results:

• The device accurately measures kinematics, as verified by comparison with a marker-based 3D-motion capture system.
• Feasibility demonstrated through testing with neurotypical children and children with upper-extremity impairments in a hospital setting.
• The system provides real-time audio-visual feedback to enhance user motivation during motor tasks.

Conclusions:

• The developed device offers a portable and accurate solution for quantitative motor assessment of upper-limb movement disorders in non-laboratory settings.
• This low-cost rehabilitation device has the potential to increase the volume of in-home physical therapy.
• The interactive nature of the device, inspired by daily challenges, can improve self-confidence and participation in daily activities.