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Vacuum-Assisted Eggshell-Type Bone Debridement with Implantation of Antibiotic-Impregnated Bone Substitute for Treatment of Calcaneal Osteomyelitis with Subsequent Charcot’s Reconstruction: A Case Report

Grant Yonemoto Department of Podiatric Surgery, Yale New Haven Hospital, New Haven, CT.

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Timothy P. Cheung Department of Podiatric Surgery, Yale New Haven Hospital, New Haven, CT.

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Steven D. Vyce Department of Surgery, Yale University School of Medicine, New Haven, CT.

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Michael I. Gazes Department of Medicine, Yale University School of Medicine, New Haven, CT.

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Charcot’s neuroarthropathy complicated by calcaneal osteomyelitis can be difficult to treat. Various surgical techniques describe how to manage these conditions. Eggshell-type debridement with application of antibiotic-impregnated bone substitute is a viable option that eliminates infected bone and allows staged reconstructive surgery. A 50-year-old woman with right midfoot Charcot’s neuroarthropathy presented with osteomyelitis of the cuboid and fourth and fifth metatarsal bases after resection and failed antibiotic therapy. The patient eventually developed adductovarus, septic shock, and hematogenous osteomyelitis of the calcaneus, navicular, and lateral cuneiform. Vacuum-assisted eggshell-type debridement was performed, and the calcaneal defect was filled with antibiotic-impregnated calcium sulfate and calcium phosphate. Eight weeks after the initial surgery, the infection resolved; however, the patient had trouble walking. She underwent staged Charcot’s reconstructive surgery with application of a dynamic multiplanar external fixator with gradual deformity and split-thickness skin graft to cover the residual plantar lateral foot wound. The second stage included septic fusion of the midfoot and subtalar joint from the frame. Twelve weeks postoperatively, radiographic union was achieved, the external fixator was removed, and the patient demonstrated a plantigrade foot. She was transitioned to a total-contact cast and allowed to bear weight as tolerated. Eighteen months after the initial procedure, the patient is wound-free and weightbearing in a CROW boot. This innovative eggshell-type debridement technique aspirates osteomyelitic cancellous bone while preserving cortical bone. It can be particularly useful in hematogenous osteomyelitis, where cortical integrity is not breached, or in situations where there is minimal cortical involvement. Specifically preserving the calcaneus, a major weightbearing bone, permits subsequent reconstructive surgical planning. At 18 months, there were no signs of osteomyelitis recurrence.

Corresponding author: Timothy P. Cheung, DPM, PhD, CPT, Department of Podiatric Surgery, Yale New Haven Hospital, 330 Orchard St, Suite MOB207, New Haven, CT 06511. (E-mail: timothy.cheung@yale.edu)
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