Review Question - QID 220047

A 68-year old retired architect undergoes the procedure shown in Figure A, which represents his immediate post-operative film. He progresses well, has no pain, and has regained motion with forward flexion to 150 degrees, external rotation to 40 degrees, and internal rotation to the level of the L5 vertebra. He is now nine months from the index procedure with the radiographic finding shown in Figure B. He denies fevers, chills, night sweats, and has not had any decline in his motion or overall degree of function. Which of the following represents the most appropriate next step in his post-operative management?