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Joseph Myers, John Jolly, Takashi Nagai, and Scott Lephart


In vivo scapular kinematics during humeral movements are commonly assessed with electromagnetic tracking devices despite few published data related to reliability and precision of these measurements.


To determine the intrasession reliability and precision of assessing scapular kinematics using an electromagnetic tracking device.


Scapular position and orientation were measured with an electromagnetic tracking device during humeral elevation/depression in several planes. Intrasession reliability and precision were established by comparing 2 trials performed in succession.


A human-movement research laboratory.


15 healthy individuals.

Main Outcome Measures:

Intrasession intraclass correlation coefficients and standard error of measurement of all scapular variables were established.


The mean intrasession reliability for all variables was ICC = .97 ± .03. The mean intrasession precision was .99° ± .36°.


In vivo scapular kinematics can be measured with high reliability and precision during intrasession research designs.