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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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RoMetric: A Multi-Camera System for Accurate and Comprehensive Hand Joint ROM Evaluation.

Beibei Hou, Ying Wang, Chetwyn Che Hin Chan

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |November 10, 2025
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    Summary

    RoMetric, a new multi-camera system, accurately measures hand joint range of motion (ROM) non-invasively. This technology significantly speeds up assessments and offers precise, reliable data for rehabilitation and research.

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    Area of Science:

    • Biomedical Engineering
    • Rehabilitation Technology
    • Clinical Biomechanics

    Background:

    • Hand joint range of motion (ROM) is crucial for evaluating hand function, disability, and rehabilitation progress.
    • Traditional goniometry and existing vision-based methods have limitations in accuracy and objectivity.
    • There is a need for advanced, non-invasive systems for precise hand ROM assessment.

    Purpose of the Study:

    • To introduce RoMetric, a novel multi-camera system for accurate and comprehensive hand-joint ROM evaluation.
    • To overcome the limitations of current ROM measurement techniques.
    • To provide an objective, reliable, and efficient tool for clinical and research applications.

    Main Methods:

    • Development of RoMetric, a non-invasive system utilizing synchronized multi-view imaging from four RGB cameras.
    • Implementation of 3D joint reconstruction and biomechanically informed angle computation.
    • Utilizing a standardized seven-pose protocol to assess 15 hand joints across 20 degrees of freedom (DOFs).

    Main Results:

    • Strong agreement between RoMetric and clinical goniometry for flexion angles (ICC(3,1) = 0.75-0.91).
    • Robust test-retest reliability with a mean error (ME) below 5° for 80% of assessed joints.
    • Significant reduction in assessment time, with an 87% decrease compared to manual goniometry.

    Conclusions:

    • RoMetric provides accurate, reliable, and efficient non-invasive hand-joint ROM measurements.
    • The system demonstrates substantial time savings, enhancing clinical workflow.
    • RoMetric is suitable for high-precision measurements in both clinical practice and research settings.