Review Question - QID 218196

A 78-year-old female with a history of rheumatoid arthritis presents to the clinic with the chief complaint of knee pain. The patient has low functional demands and her goal for surgery is to be able to go on short walks without limiting pain. She has trialed NSAIDS, physical therapy, and injections however her pain is recalcitrant to conservative measures. She has a 20-degree flexion contracture, considerable laxity when applying a valgus force to her knee, and a positive posterior drawer sign. Otherwise, her physical examination is unremarkable. Her presenting radiograph is demonstrated in Figure A. Which of the following is the most appropriate next step in management?