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A 12-year-old male presents to urgent care with his mother for left groin and buttock pain since acute onset while running in a track meet earlier today. He reports that he felt a pop while running a sprint race and was subsequently unable to finish the race or bear weight on his left leg due to pain. He has no other past medical history and takes no medications. Physical exam reveals that he is afebrile with normal vital signs besides an elevated heart rate at 108 bpm. He is visibly uncomfortable at rest and passive flexion, and internal rotation of the hip elicit pain.
View the AP x-ray image taken and consider what your diagnosis and next steps would be. Resolution of the case is described on the next page.

