Case ReportCatastrophic metallosis after tumoral knee prosthesis failure: A case report

•A rare case of huge metallosis is presented.•If prosthesis brackage is detected, revision surgery should be attempted.•A regular follow-up after surgery it's the best way to success.

IntroductionMetallosis is a condition characterized by an infiltration of periprosthetic soft tissues and bone by metallic debris resulting from wear or failure of joint arthroplasties.Presentation of caseAuthors describe a case of a 45-year-old man treated for an osteosarcoma of the distal femur with a modular prosthesis when he was 18 years old, he developed massive metallosis with skin dyspigmentation after 17 years. His medical\surgical history was remarkable for a left tumoral knee prosthesis implanted 21 years ago. Two years before revision, the patient had a car accident with a two-points prosthesis breakage and despite the surgeon's advice, the patient refused surgery. In two years, prosthesis malfunction caused a progressive catastrophic soft tissues infiltration of metallic debris.Discussion and conclusionAuthors suggest that if prosthesis fracture is detected, revision surgery should be attempted as earlier as possible.