Review Question - QID 212420

A 13-year-old boy presents to the emergency department for evaluation of groin pain. He states that he has had pain in his left groin that has been worsening over the last several weeks. He states that his pain is worsened when he walks, and radiates to his knee. His medical history is significant for obesity and asthma. His temperature is 98°F (36.7°C), blood pressure is 124/65 mmHg, pulse is 128/min, respirations are 14/min, and oxygen saturation is 99% on room air. Physical exam is notable for an inability of the patient to bear weight on his left leg and limited range of motion of the left hip. A radiograph of the patient's hip is obtained as shown in Figure A. Which of the following is the most appropriate next step in management?