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An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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An inertial sensor-based protocol for spinal range of motion measurements.

P J Mulcahey1, P T Knott2, A Madiraju1

  • 1The Institute for Spine and Scoliosis, Lawrenceville, NJ.

Studies in Health Technology and Informatics
|June 30, 2021
PubMed
Summary

This study developed a reliable protocol using inertial sensors to measure spinal range of motion. The new method demonstrates high accuracy and consistency for assessing spine movement, crucial for clinical applications.

Keywords:
Inertia sensorreliabilityspine motion

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Area of Science:

  • Biomechanics
  • Medical instrumentation
  • Rehabilitation technology

Background:

  • Accurate measurement of spinal range of motion (ROM) is essential for diagnosing and managing musculoskeletal conditions.
  • Existing methods for assessing spinal ROM can be cumbersome or lack objective quantification.
  • Inertial sensor devices offer a potential solution for objective and portable ROM assessment.

Purpose of the Study:

  • To develop and validate a protocol for assessing spinal range of motion using an inertial sensor device.
  • To establish the reliability (intra-rater and inter-rater) of this novel inertial sensing protocol.
  • To determine the baseline error of the inertial sensor used in the study.

Main Methods:

  • Assessed baseline sensor error using a bicycle wheel.
  • Recruited 19 healthy subjects (12 female, 7 male) for prospective enrollment.
  • Three raters performed three trials each for spinal flexion/extension, lateral bending, and rotation measurements.
  • Utilized correlation coefficients and Intraclass Correlation Coefficient (ICC (3,1) for intra-rater, ICC (3,2) for inter-rater) to analyze reliability.

Main Results:

  • The baseline error of the inertial sensor was determined to be 1.45°.
  • Intra-rater reliability (ICC (3,1)) for the protocol exceeded 0.888, indicating high consistency.
  • Inter-rater reliability (ICC (3,2)) for the protocol exceeded 0.87, demonstrating high agreement between different raters.

Conclusions:

  • A reliable protocol for assessing spinal range of motion using inertial sensors has been successfully developed.
  • The protocol exhibits high intra-rater and inter-rater reliability, making it suitable for clinical use.
  • The study provides a validated method for objective spinal motion assessment and a paradigm for sensor error evaluation.