Metastatic endometrial carcinoma invading bilateral total knee arthroplasties

We present a case of a 64-year old female with bilateral knee pain several months after undergoing staged bilateral TKA. Radiolucencies surrounding the keels of bilateral tibial components were found to represent metastatic poorly differentiated endometrial carcinoma. PET scan showed adrenal, pulmonary and tibial foci consistent with metastatic disease. No other cases of bilateral periprosthetic metastasis of endometrial carcinoma have been described in the literature. Metastases around orthopedic implants are a rare occurrence. The possibility of periprosthetic metastasis should remain in the differential diagnosis for any patient with a painful total joint arthroplasty, especially in the setting of a patient with a known diagnosis of cancer elsewhere in their body.