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A 21-year-old infantryman dislocates his shoulder during basic training. He is able to make it through training but continues to experience recurrent dislocations. A CT demonstrates anterior glenoid bone loss and your sports colleagues indicate him for a Latarjet procedure. The procedure successfully restores stability to his shoulder, but the patient is referred to your office just over 3 months later because he has persistent difficulty with abduction when the arm is internally rotated. You suspect an iatrogenic nerve injury sustained during anterior shoulder exposure and offer him a nerve transfer procedure involving the branch of the radial nerve that innervates the medial head of triceps. The nerve that is injured in this patient innervates what muscles?
Deltoid, teres minor, and supraspinatus
Deltoid, teres minor, and teres major
Teres minor and teres major
Deltoid and teres major
Deltoid and teres minor
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A 32-year-old female sustains a proximal humerus fracture shown in Figure A. This fracture goes on to uneventful union, but she complains of a lack of sensation over the lateral deltoid and has weakness with the Hornblower's test at final follow-up. Which of the following structures is most likely injured in this patient?
Anterior branch of the axillary nerve
Posterior branch of the axillary nerve
Posterior cord of the brachial plexus