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ing superior clinical results when combined with porous coated substrate. In our study,though the cause of massive polyethylene wear and intrapelvic giant osteolysis could not berevealed, the porous cup with AW-GC bottom coating was well fixed and gained boneingrowthat the porous surface under osteolytic conditions, which may demonstrate the longtermdurability of this surface treatment.Friday, October 8, 2010, 7:30-8:30Session B9: Complications in ArthroplastyManagement of Unstable Total Hip Arthroplasty Using a Dual MobilityCupIntroduction:*Olivier Guyen - Edouard Herriot Hospital - Lyon, FranceChristophe Chevillotte - Edouard Herriot Hospital - LYON, FRANCEJulien Wegrzyn - Edouard Herriot Hospital - LYON, FRANCEVincent Pibarot - Edouard Herriot Hospital - LYON, FRANCEJacques Bejui-Hugues - ICOT - Latina, ITALYJean-Paul Carret - Edouard Herriot Hospital - LYON, FRANCE*Email: oguyen@hotmail.comReoperations to manage unstable total hip arthroplasty are reported with a high failure rate. Thedual mobility cup (figure 1) (mobile polyethylene component between the prosthetic head andthe outer metal shell) is a useful option in such cases. The purpose of this retrospective studywas to assess the clinical and radiologic features associated with the dual mobility cup.Materials and Methods:Fifty one unstable total hip arthroplasties (32 females, 19 males) were revised using a dualmobility socket at our institution between March 2000 and February 2005.Mean age at reoperation was 67 year old (range, 35 to 98). The outcome of the revisionprocedure was assessed using the Harris Hip Score, and complications were determined bydetailed review of the patient’s records. Anteroposterior and lateral radiographs of the involvedjoint were reviewed to assess the position of the prosthesis and to look for osteolysis and signsof loosening of the implant.Results:Mean follow-up was 4 years (range, 2 to 6.7). At last review 4 patients had died and one waslost to follow up. Postoperatively there was a significant improvement of the Harris Hip Score.Fifty patients (98%) had no further episodes of dislocation. There were 3 revisions for deepinfection, and 2 for dissociation of the bipolar component. No cup required a revision foraseptic loosening. No radiolucent lines around the components and no osteolysis were observedat latest follow up.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]