Daily Bolus of LR: Infraspinatus- Function and Testing

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February 14, 2011 by dailybolusoflr



·         Connects from the medial border of the scapula, running under the scapular spine to the greater tuberosity of the humerus.

·         Contraction allows the arm to rotate externally.

·         The other rotator cuff muscle which assists in external rotation is the teres minor.

·         The infraspinatus is the 2nd most commonly injured rotator cuff muscle.



·         Bend the elbows to 90 degrees

·         Slightly abduct their shoulder, roughly 30 degrees, while keeping both elbows bent at 90 degrees

·         Place your hands on the outside of their forearms.

·         Have the patient push their arms outward (externally rotate) while you resist.

·         Tears in the muscle will cause weakness and/or pain.


The following website has nice photos of all of the tests for the various rotator cuffs:





Linda Regan, MD FACEP

Program Director, Emergency Medicine Residency

Johns Hopkins Medical Institutions


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