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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
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