Review Question - QID 212151

A 13-year-old boy presents with a 6-week history of acute right knee pain and difficulty ambulating after an intramural basketball game despite 4 weeks of physical therapy . His father reports his right knee had caused him some intermittent aches over the last year. Physical examination reveals moderate effusion, lateral sided tenderness, and range of motion from 10-110 degrees without any signs of instability. Plain radiographs are obtained and reveal cupping of the lateral tibial plateau. An MRI is obtained and representative cuts are highlighted in Figure A. What is the best next step in management?