Review Question - QID 220389

A 32-year-old female presents to your clinic one week after an emergency department visit for right knee pain following an injury she sustained playing basketball. Radiographs from the emergency department are shown in Figure A. She was initially placed in a knee immobilizer and instructed to bear weight as tolerated in knee extension, with short-term orthopedic follow-up to determine definitive treatment. In clinic, she demonstrates 0 – 130º knee range of motion with mild pain, 5/5 strength in knee extension, and no deficit in straight leg raise. What is the most likely etiology of her radiographic findings?