title: Metallosis with pseudotumour formation: Long-term complication following cementless total hip replacement in a dog.
abstract: METHODS
  A 10-year-old female Belgian Teruven dog was presented to our clinic for total hip revision following a diagnosis of implant (cup) failure with metallosis and abdominal pseudotumour formation. The patient had a cementless metal-on-polyethylene total hip replacement performed nine years prior to presentation.
  
  
  RESULTS
  The clinical findings, including pseudotumour formation locally and at sites distant from the implant and pain associated with the joint replacement, were similar to those described in human patients with this condition. Histopathological, surgical, and radiographic findings additionally supported the diagnosis of metallosis and pseudotumour formation.
  
  
  RESULTS
  Distant site pseudotumours were surgically removed and the total hip replacement was explanted due to poor bone quality. The patient recovered uneventfully and has since resumed normal activity.
  
  
  CONCLUSIONS
  In veterinary patients with metal-on-polyethylene total hip implants, cup failure leading to metallosis and pseudotumour formation should be considered as a potential cause of ipsilateral hindlimb lameness, intra-pelvic abdominal tumours, or a combination of both. These clinical findings may occur years after total hip replacement surgery.
authors.forename: Nicola J
authors.initials: NJ
authors.lastname: Volstad
authors.forename: Susan L
authors.initials: SL
authors.lastname: Schaefer
authors.forename: Laura A
authors.initials: LA
authors.lastname: Snyder
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Meinen
authors.affiliation: Dr. Susannah Sample, University of Wisconsin-Madison, School of Veterinary Medicine, Department of Surgical Sciences, 2015 Linden Drive, Madison, WI 53706, United States, E-mail: Susannah.sample@wisc.edu.
authors.forename: Susannah J
authors.initials: SJ
authors.lastname: Sample
mesh_terms: D000818:Animals; D003560:Cysts / Q000209:etiology / Q000662:veterinary; D004283:Dog Diseases / Q000209:etiology* / Q000473:pathology; D004285:Dogs; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects / Q000662:veterinary*; D007249:Inflammation / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology / Q000662:veterinary; D011475:Prosthesis Failure / Q000009:adverse effects; D011859:Radiography / Q000662:veterinary
keywords: Total hip replacement; canine orthopaedics; metallosis; pseudotumour