A 43-Year-Old Man Comes to the Office Due to Difficulty

A 43-year-old man comes to the office due to difficulty walking.  The patient was seen at an outpatient clinic 2 days ago and received a right-sided deep intramuscular injection.  He had no trouble walking at the time of the appointment but started having problems later that day.  The patient has no history of trauma or pain at the injection site.  Physical examination is negative for local erythema and swelling, and the patient has full strength against resistance on knee flexion and ankle plantar flexion bilaterally.  When the patient is asked to walk across the room, his left hip drops every time he raises his left foot.  Which of the following locations is the most likely site of this patient's intramuscular injection?

A) Inferolateral quadrant of the buttock
B) Inferomedial quadrant of the buttock
C) Superior portion of the posterior thigh
D) Superolateral quadrant of the buttock
E) Superomedial quadrant of the buttock

Correct Answer:

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