A 52-year-old man sustained the left elbow injury shown in Figure A while playing basketball 2.5 months ago. He underwent the procedure shown in Figure B. Post-operatively he was mobilized in a hinged brace. On examination today, his arc of elbow flexion is 75 degrees with loss of 45 degrees of full extension. His Disabilities of the Arm, Shoulder and Hand (DASH) Outcome Measure score is 45 points. What initial treatment option will likely provide the greatest improvement in this patients DASH score and functional range of motion?