Abstract
Tenosynovial giant cell tumor (TGCT) occurs in both diffuse and localized forms. While diffuse TGCT is an uncommon but well-described complication after total knee arthroplasty (TKA), localized TGCT has only once been previously described as a postoperative complication after TKA. We report on the diagnosis and management of a patient who developed postoperative localized TGCT after routine TKA and underwent uncomplicated removal. Postoperatively the patient noted a resolution of pain and mechanical symptoms. Early consideration of this rare occurrence after TKA can prevent significant pain and disability due to delayed diagnosis.