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Angle Assessment for Upper Limb Rehabilitation: A Novel Light Detection and Ranging (LiDAR)-Based Approach.

Luan C Klein1,2, Arezki Abderrahim Chellal1,3, Vinicius Grilo1

  • 1Research Centre in Digitalization and Intelligent Robotics (CeDRI), Polytechnic Institute of Bragança, 5300-252 Bragança, Portugal.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
Summary

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This study explored a hybrid camera and LiDAR approach for measuring joint angles in physical therapy, finding slight accuracy improvements over image-only methods but with increased costs and reduced fluidity. Further research is needed to assess its practical viability.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Computer Vision

Background:

  • Accurate joint angle measurement is vital for physiotherapy decision-making.
  • Current visual inspection methods for angle assessment are prone to significant errors.
  • There is a need for more precise and reliable joint angle measurement techniques.

Purpose of the Study:

  • To investigate a novel hybrid approach combining camera and LiDAR technology for joint angle calculation.
  • To evaluate the accuracy and practicality of this AI-driven hybrid method in patient rehabilitation settings.

Main Methods:

  • A hybrid system integrating camera (image data) and LiDAR (point cloud data) was developed.
  • Artificial intelligence (AI) techniques were employed for joint identification and angle computation.
Keywords:
Artificial IntelligenceLiDARjoin angle measurementmotion capturerobotic rehabilitation

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  • Testing involved various exercises from different perspectives and distances.

    • Main Results:

    • The hybrid camera-LiDAR approach demonstrated a slight improvement in angle calculation accuracy compared to YOLO v7 (image-based).
    • The system incurred higher costs due to specialized equipment (LiDAR).
    • A decrease in fluidity during exercise performance was observed.

    Conclusions:

    • The hybrid camera-LiDAR method shows potential for improved joint angle measurement in rehabilitation.
    • The current cost-benefit analysis raises questions about its widespread adoption.
    • Further exploration is warranted to optimize the methodology and address limitations.