Successful Limb Salvage in MRSA Bacteremic Septic Charcot Midfoot Using Continuous Local Antibiotic Perfusion and Circular External Fixation: A Case Report

Background: Septic Charcot neuroarthropathy is a limb- and life-threatening condition characterized by the coexistence of neuropathic joint destruction and infection. In patients with severe systemic compromise, major amputation is often considered inevitable. Case Presentation: A 47-year-old man with untreated diabetes mellitus presented with progressive painless swelling of the left foot. He had morbid obesity (120 kg, 165 cm; body mass index 44.1 kg/m2), severe hypoalbuminemia, and chronic kidney disease associated with nephrotic syndrome. Laboratory tests showed marked inflammation and poor glycemic control, and blood cultures were positive for methicillin-resistant Staphylococcus aureus (MRSA). Radiographs and computed tomography demonstrated destructive changes involving the talonavicular and subtalar joints, consistent with septic Charcot neuroarthropathy involving the midfoot. Because of sepsis, pulmonary edema, and heart failure, below-knee amputation was proposed at the referring hospital. However, limb salvage was attempted using aggressive debridement, continuous local antibiotic perfusion (CLAP; gentamicin 1200 μg/mL) administered for 14 days, and temporary circular external fixation. Serum gentamicin concentrations and renal function were regularly monitored to ensure systemic safety and avoid nephrotoxicity. Results: Repeat irrigation and final debridement were performed 20 days after the index surgery, at which time the external fixator was removed and intraoperative cultures were negative. The patient was discharged 2 months after surgery without evidence of recurrent infection. At 4-year follow-up, no recurrence had occurred, and the patient was able to walk independently. Conclusions: Limb salvage may be feasible even in severely compromised patients with septic Charcot midfoot and MRSA bacteremia when aggressive debridement, CLAP, and temporary external fixation are combined with careful systemic safety monitoring. This case suggests that limb salvage may be considered in selected high-risk patients, although further studies are required.