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Measurement variability in upper extremity posture among VDT users

D J Ortiz1, M Marcus, F Gerr

  • 1Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, USA.

Applied Ergonomics
|April 1, 1997
PubMed
Summary
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Manual goniometry effectively measures upper extremity posture in video display terminal (VDT) operators. This method offers reliable data for studying the link between posture and upper extremity musculoskeletal disorders (UEMSDs).

Area of Science:

  • Ergonomics and Occupational Health
  • Musculoskeletal Disorder Epidemiology

Background:

  • Hand and arm posture during keyboard use is a known risk factor for upper extremity musculoskeletal disorders (UEMSDs) in video display terminal (VDT) operators.
  • Assessing VDT operator posture in epidemiological studies is challenging due to difficulties in rapid and reliable measurement.
  • Reliable posture measurement requires between-subject variability to exceed within-subject variability and stability over time.

Purpose of the Study:

  • To evaluate the reliability and stability of manual goniometry for measuring upper extremity posture in VDT operators.
  • To determine if manual goniometry can provide valid data for epidemiological studies on UEMSDs.

Main Methods:

  • Manual goniometry was used to measure six postural angles in 19 VDT operators.

Related Experiment Videos

  • Measurements were taken on six separate occasions for each subject.
  • The ratio of between-subject to within-subject variability was calculated for each postural angle.

    • Main Results:

    • Between-subject variability was significantly larger than within-subject variability for all measured postural angles.
    • Postural measurements demonstrated sufficient stability over time.
    • These findings support the use of a single postural measurement in epidemiological research.

    Conclusions:

    • Manual goniometry is a reliable and stable method for assessing upper extremity posture in VDT users.
    • This technique can yield valuable data for epidemiological studies investigating UEMSDs.
    • The study validates manual goniometry as a practical tool for occupational health research.