A 53-Year-Old Man Comes to the Office with a Dull

A 53-year-old man comes to the office with a dull ache in his right shoulder.  The pain is worse with movement and often interferes with his sleep.  The patient cannot recall any traumatic events prior to the start of the pain but did experience increased discomfort after helping his daughter move into her college dorm room a week ago.  His past medical history includes dyslipidemia and hypertension, for which he takes the appropriate medications.  Physical examination reveals localized tenderness just below the acromion.  The physician asks the patient to abduct his arms 90 degrees to the side and flex them 30 degrees forward with his thumbs pointing to the floor.  She then applies downward force to his arms.  This maneuver elicits pain in the patient's right shoulder and reveals right-sided weakness as compared to the left side.  A tendon of which of the following muscles is most likely injured in this patient?

A) Biceps brachii
B) Deltoid
C) Levator scapulae
D) Serratus anterior
E) Supraspinatus

Correct Answer:

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