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Related Experiment Videos

Standardized initial head position in cervical range-of-motion assessment: reliability and error analysis.

A B Solinger1, J Chen, C A Lantz

  • 1Research Department, Life Chiropractic College West, Hayward, CA 94541, USA.

Journal of Manipulative and Physiological Therapeutics
|February 5, 2000
PubMed
Summary

The OSI CA-6000 Spinal Motion Analyzer demonstrates high reliability for measuring cervical spine range of motion, particularly for rotation and lateral bending. This instrument offers precise measurements with minimal variability in pain-free subjects.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Medical Device Technology

Background:

  • Accurate measurement of cervical spine range of motion (ROM) is crucial for diagnosing and managing spinal conditions.
  • Existing methods for assessing cervical ROM may have limitations in precision and reliability.
  • The OSI CA-6000 Spinal Motion Analyzer is a device designed for quantitative ROM assessment.

Purpose of the Study:

  • To evaluate the clinical reliability and precision of the OSI CA-6000 Spinal Motion Analyzer for cervical spine ROM measurements.
  • To assess the impact of a novel procedure designed to minimize variability and quantify error sources.
  • To determine the accuracy of the CA-6000 in measuring rotation, lateral bending, and flexion-extension in pain-free individuals.

Main Methods:

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  • Twenty asymptomatic subjects underwent repeated ROM measurements by two examiners.
  • Standardized subject positioning and a novel measurement protocol were employed.
  • Interclass correlation coefficients (ICCs) were calculated to assess reliability, alongside systematic and random error analysis.

    • Main Results:

    • The CA-6000 demonstrated high reliability for rotation (ICC 0.93-0.97) and lateral bending (ICC 0.93-0.97).
    • Acceptable reliability was found for flexion-extension (ICC 0.75-0.93).
    • Estimated clinical errors were approximately 4.5 degrees, with minimal systematic errors related to placement or posture.

    Conclusions:

    • The modified CA-6000, with standardized positioning, is a precise and reliable tool for measuring active cervical ROM across three Cartesian axes.
    • The instrument allows for highly repeatable measurements with minimal variation between trials.
    • While effective for rotation and lateral bending, the design for flexion-extension measurement could benefit from further improvement.