Review Question - QID 219125

Figure A is a radiograph of a 25-year-old male who arrived in the trauma bay following a motorcycle collision. He is intubated and sedated in the trauma bay for a Glasgow Coma Score of 7. His vital signs are as follows: temperature 37.0ºC (98.6ºF), heart rate 126, blood pressure 84/60, and SpO2 100% on mechanical ventilation. His initial labs are as follows: white blood cell count 14.5, hemoglobin 8.2, platelets 254, base excess -6.4. He undergoes an emergent closed reduction in the trauma bay. On secondary physical examination, he has a positive Lachmann to his ipsilateral knee and is ligamentously lax to valgus stress. Figure B is an axial slice of a CT pelvis following closed reduction. What is the next best step?