Review Question - QID 219836

An 18-year-old female presents to the clinic complaining of severe ankle pain and an inability to ambulate after being slide-tackled during a semifinal soccer game one week ago. The parents state that the athletic trainer performed a focused on-field examination, which revealed a closed injury, intact perfusion to the toes, intact neurologic function, and tenderness about the ankle. The leg was provisionally immobilized, and the patient was brought to an urgent care clinic where subsequent radiographs were taken, as shown in Figures A through C. The patient and family were told that there was no fracture and instructed to follow up in your clinic. The patient is still complaining of severe leg pain and instability with attempted ambulation. Which additional injury was most likely missed in the initial workup?