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Journal of Long-Term Effects of Medical Implants

Published 4 issues per year

ISSN Print: 1050-6934

ISSN Online: 1940-4379

SJR: 0.184 SNIP: 0.485 CiteScore™:: 1.1 H-Index: 39

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Severe Metallosis Following Polyethylene Dislocation in a Mobile-Bearing Medial Unicompartmental Knee Replacement

Volume 24, Issue 2-3, 2014, pp. 147-150
DOI: 10.1615/JLongTermEffMedImplants.2014010563
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ABSTRACT

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 woman who was admitted to our department with a 5-month history of a painful right knee. There was no history of trauma 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 patient complained that the knee was becoming unstable, was painful, and was making frequent clicking noises associated with metallic friction. Plain radiographs of the right knee showed dislocation of the polyethylene bearing and the patient 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 polyethylene 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 patient 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.

CITED BY
  1. Sahan Ismail, Anagnostakos Konstantinos, Metallosis after knee replacement: a review, Archives of Orthopaedic and Trauma Surgery, 140, 11, 2020. Crossref

  2. Janssen Stein J., van Oost Iris, Breugem Stefan J.M., van Geenen Rutger C.I., A structured evaluation of the symptomatic medial Oxford unicompartmental knee arthroplasty (UKA), EFORT Open Reviews, 6, 10, 2021. Crossref

  3. Vajapey Sravya P., Alvarez Paul M., Chonko Douglas, Bearing failure in a mobile bearing unicompartmental knee arthroplasty: an uncommon presentation of an implant-specific complication, Arthroplasty, 3, 1, 2021. Crossref

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