A 16-Year-Old High School Quarterback Comes to the Office Due

A 16-year-old high school quarterback comes to the office due to left shoulder pain.  One week ago, he suffered an injury during a football game.  The patient was running with the football when another player tackled him to the ground, causing him to land directly on the posterior aspect of his left shoulder.  He developed severe pain immediately and did not return to the game.  The patient has had persistent shoulder pain since the injury despite using ice and over-the-counter ibuprofen.  He has been unable to resume playing football due to pain and weakness in his shoulder.  On examination, there is diffuse bruising over the posterior aspect of the left shoulder.  Abduction of the left arm is normal, but external rotation against resistance is weak and painful.  Which of the following muscles is most likely injured?

A) Biceps brachii
B) Infraspinatus
C) Subscapularis
D) Supraspinatus
E) Teres major
F) Trapezius

Correct Answer:

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