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NBME 23 Answers

nbme23/Block 3/Question#41

A previously healthy 45-year-old man comes to the ...


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 +6  upvote downvote
submitted by sugaplum(78),

always remember them in order with formula, SITS=AEEI
and the two on the END are AD-DUCTION

 +4  upvote downvote
submitted by yotsubato(364),

So this question is describing a guy having difficulty externally rotating his arm while the forearm is flexed. He is able to supinate while his arm is extended (because of the supinator muscle and biceps). In the rotator cuff, only the infraspinatus performs external rotation, so that is the best choice.

Biceps works fine here

Subscapularis performs internal rotation.

Supraspinatus performs abduction

Triceps provides extension of forearm.

bigjimbo  technically rotator cuff infraspinatous and teres minor do ER (but teres minor is not a answer choice0 +3