Review Question - QID 7742

A 45-year-old woman undergoes an uncomplicated total knee arthroplasty. Nine months later she has not yet returned to work because of pain and stiffness. Her range of motion is 5 to 80 degrees. She has no instability, is unable to climb stairs normally, sitting in low chairs is uncomfortable, and she no longer participates in physical therapy. She has pain with prolonged standing. Radiographs show a well-aligned, cruciate-retaining implant. Work-up for infection, including joint aspiration, is negative. What is the next step in management?