Review Question - QID 214107

Figures A and B are the MRI images of a 54-year-old male who presents with persistent left shoulder pain. He has trialed an 12-week course of formal physical therapy and had a cortisone injection 12-weeks prior without any significant symptomatic improvement. On physical examination, he has full symmetric passive range of motion, but moderately limited active range of motion, most notably with forward flexion and external rotation with the arm at the patient's side. Rotator cuff strength is otherwise symmetric. What is the next best step in management?