title: Dislocation of a dual mobility total hip replacement following fracture of the polyethylene liner.
abstract: An eight-year-old male English Setter was referred for management of a dislocation of a cemented dual mobility canine total hip prosthesis that occurred four months after the initial surgery. Revision surgery showed that the dislocation was associated with fracture of the ultra-high molecular weight polyethylene liner. The dislocation was successfully reduced after replacing the liner. A dual mobility acetabular component is composed of a mobile polyethylene liner inside a metallic cemented cup. Chronic wear of the components of a canine dual mobility total hip replacement has not been described previously. The use of this type of implant is fairly recent and limited long term follow-up of the implanted cases may be the explanation. Acute rupture of a polyethylene liner has never been described in humans, the only case of rupture of a polyethylene liner occurred 10 years after implantation. The case presented here of rupture of the polyethylene liner of a dual mobility total hip replacement is a hitherto unreported failure mode in this model of acetabular cup in the dog.
authors.affiliation: Dr Bertrand Vedrine, Clinique Vétérinaire Cauchoise, 5, place Cauchoise, 76000 Rouen, France, Phone : +33 2 35 71 33 41, Fax: +33 2 35 70 60 94, E-mail: bvedrine@yahoo.fr.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Vedrine
authors.forename: Pierre
authors.initials: P
authors.lastname: Guillaumot
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Chancrin
mesh_terms: D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000662:veterinary*; D004283:Dog Diseases / Q000209:etiology* / Q000601:surgery; D004285:Dogs; D008297:Male; D011475:Prosthesis Failure / Q000209:etiology*
keywords: Hip; dislocation; dual mobility; prosthesis; replacement