A 7-year-old nonverbal boy with severe Autism is brought to the emergency department by his caretaker after noticing a bump over the left elbow. She states that the patient falls often but is not sure when the bump first appeared. The patient moves his bilateral upper extremities spontaneously and without apparent discomfort. Examination of his left elbow is notable for a prominence over the posterolateral elbow that is nontender. Plain radiographs are pictured in Figures A and B. What is the next best step in management?