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Review Question - QID 7695

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QID 7695 (Type "7695" in App Search)
Five weeks following total knee arthroplasty, a woman has intermittent knee drainage for 1 week. Clear serous drainage is coming from her wound from a small area in the central portion of her incision. Her medical comorbidities include hypertension and a BMI of 50. Fluid aspirated from the knee shows a WBC of 11,500/mm3 with 92% polymorphonuclear cells. Methicillin-resistant Staphylococcus aureus grows from an aspirate on day 2. What is the next step in management?