A 13-year-old male presents to your office with right elbow pain. He is the star pitcher on his little-league baseball team. He states that he has had ongoing elbow pain for 9 months. He endured a 3-month period of rest over the winter which did improve his pain but it returned early in the spring. Additionally, he now complains of a locking sensation in the elbow near full extension. Radiographs are suggestive of capitellar osteochondritis dissecans (OCD) and an MRI is obtained. It demonstrates an unstable 0.8 cm^2 osteochondral lesion with an intact cartilage cap and no loose bodies. What is the next best step in treatment at this point?