Metal hypersensitivity after a total knee arthroplasty
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The case presented is of a 65-year-old male who presented with pain, swelling, and erythema in left knee 8 months status post total knee arthroplasty by another surgeon. Radiographs demonstrated a mildly oversized femoral component and an asymmetric patella. Periprosthetic joint infection workup was negative. On subsequent visits, the pain was out of proportion to what would be expected for oversized or malpositioned
components. The patient had no documented history of metal allergy, however, testing was performed. The patient was found to be reactive to nickel, which is a common alloy, used in most total knee arthroplasty implants. Patient was then scheduled for revision to a nickel free, Oxinium (Smith & Nephew) total knee arthroplasty implant

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