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Ranges of movement at the shoulder complex using an electromagnetic movement sensor
G R Johnson1, N C Fyfe, M Heward
1Department of Mechanical, Materials and Manufacturing Engineering, University of Newcastle upon Tyne.
Annals of the Rheumatic Diseases
|November 1, 1991
Summary
This study introduces a new 3D shoulder movement assessment technique using an electromagnetic sensor. Findings show good repeatability and smaller motion ranges than previously reported in normal subjects.
Area of Science:
- Orthopedics
- Biomechanics
- Kinesiology
Background:
- Limited data exists on normal shoulder range of motion (ROM).
- No established clinical technique for assessing three-dimensional (3D) shoulder movement.
Purpose of the Study:
- To assess the repeatability and validity of a novel 3D electromagnetic movement sensor for shoulder ROM.
- To establish normative data for shoulder ROM in healthy individuals.
Main Methods:
- An electromagnetic movement sensor (Isotrak) was used to measure 3D shoulder movement in 16 healthy subjects.
- Measurements included flexion, extension, abduction, external rotation, and internal rotation.
- Intraobserver repeatability and interobserver reliability were assessed.
Main Results:
- The Isotrak system demonstrated good intraobserver repeatability.
- Interobserver reliability was also found to be non-significant.
- Measured shoulder ROM ranges were generally smaller than previously published data.
- Women exhibited greater ROM, with the exception of externally rotated abduction.
Conclusions:
- The electromagnetic sensor provides a repeatable method for 3D shoulder movement assessment.
- The developed technique offers a potential clinical tool for evaluating shoulder kinematics.
- Further research may be needed to refine the technique and understand discrepancies in ROM measurements.