Step 1

Anatomy 1

A 17-year-old boy presents to the emergency department complaining of severe left shoulder pain which began 1 hour ago. He was at his high school dodgeball game when he extended his arm out to reach for the ball. A member of the opposing team fell into him from the front, pushing against his abducted arm. The patient is unable to move his shoulder and holds it to his side. On physical examination, the area over the deltoid of his left arm appears flatter than that of his right arm. He holds his arm at a slightly abducted and externally rotated position. Radial pulses are normal and equal bilaterally.

Which of the following nerves is most likely to be injured in this type of dislocation?

  • A) Axillary nerve
  • B) Median nerve
  • C) Musculocutaneous nerve
  • D) Radial nerve
  • E) Ulnar nerve


Dr. Ted O'Connell


Dr. Ted O'Connell