Metallosis is a rare cause of failure after unicompartmental knee replacement (UKR) and has only previously been reported when there has been abnormal metal-on-metal contact. We present a case report of a 67-year-old @entity1 who was admitted to our department with a 5-month history of a @entity158 right knee. There was no history of @entity130 and her past medical history was unremarkable. She had undergone a primary mobile bearing medial UKR of her right knee 5 years ago. During the preceding 5 months, the @entity1 complained that the knee was becoming unstable, was @entity158 , and was making frequent clicking noises associated with metallic friction. Plain radiographs of the right knee showed dislocation of the @entity691 bearing and the @entity1 was taken to the operating room for revision of the implant. Intraoperatively, severe evidence of metallosis was found in the periprosthetic soft tissues. The tibial component was found to be loose and the @entity691 bearing was dislocated posteriorly. The implants were revised. Postoperative recovery was uneventful. Microscopic examination revealed findings consistent with metallosis. At the latest follow-up, the @entity1 had a good clinical and radiological outcome. In conclusion, such a complication of UKR requires early diagnosis and treatment as it can result in implant loosening and metallosis.

Severe metallosis following XXXX dislocation in a mobile-bearing medial unicompartmental knee replacement.

@entity1 :: ('9606', 'Species') :: ['woman', 'patient'] @entity130 :: ('MESH:D014947', 'Disease') :: ['trauma'] @entity691 :: ('MESH:D020959', 'Chemical') :: ['polyethylene'] @entity158 :: ('MESH:D010146', 'Disease') :: ['painful']
@entity691 :: (MESH:D020959,Chemical) :: ['polyethylene']
