Pain in your shoulder can be a truly limiting factor in your life but where
does the pain usually happen? So once this muscle contracts it normally
performs the external rotation of the arm. That is basically this movement but
you know it’s really hard for someone to hold you like this and then tell you to
rotate your arm externally. How can you oppose this rotation? Well that’s
why you should flex your arms and the elbows like this and then try to
externally rotate the arm and the examiner can then oppose that movement
and prevent you from doing so. A pain or weakness during this examination would
indicate a possible injury of the infraspinatus muscle or its tendon.
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