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A 66-year-old female presents with knee instability going down stairs 18 months after a posterior cruciate retaining total knee arthroplasty. She reports having recurrent effusions. Radiographs are shown in Figure A. What is the most likely cause for her instability?
Intraoperative rupture of the patellar tendon
Alteration of the joint line
Posterior cruciate insuffiency
Anterior cruciate insufficiency
Catastrophic component loosening
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Figure 3 shows the AP radiograph of a patient with diabetes mellitus who has knee pain. A semiconstrained knee prosthesis was used in this patient to prevent which of the following complications?