Patella dislocation

A 25-year-old man presents to the urgent care center after a backyard game of football in which he twisted his ankle. Because of alcohol intoxication, he cannot remember the mechanism of injury. He reports isolated right ankle pain and is unable to bear weight. On physical examination, he has pain with palpation of the ankle, but there are no gross signs of deformity. An ankle x-ray has already been done by the time you see …

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