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The Kaplan-Meier survival rate was 97.4% after 5 years.DISCUSSION: The present study confirmed the efficiency of the navigation system used on theaccuracy of implantation. The clinical and functional results after 5 years were at least as goodas those published after conventional implantation of uncongruent prostheses. The survival ratewas comparable as well to the already accepted gold standards. We observed no complicationdirectly related to the new prosthetic system. The mean flexion angle was better that the resultswe observed with the previously used fixed bearing system. The question of the polyethylenewear could not be assessed because of the too short follow-up period. An additional follow-upstudy is planned after 5 more years.Thursday, October 7, 2010, 14:20-15:00Session B6: Computer Navigation in TKR 2Navigated, Minimal Invasive, Mobile Bearing Unicompartmental KneeProsthesis. a 2-Year Follow-Up Study.*Jean-Yves Jenny - University Hospital Strasbourg - Illkirch, FranceFrancois Saussac - University Hospital Strasbourg - Illkirch, FrancePascal Louis - University Hospital Strasbourg - Illkirch, FranceYann Diesinger - University Hospital Strasbourg - Illkirch, France*Email: Jean-yves.jenny@chru-strasbourg.frINTRODUCTION: Computer-aided systems have been developed recently in order to improvethe precision of implantation of a total knee replacement (TKR). Several authors demonstratedthat the accuracy of implantation of an unicompartmental knee replacement (UKR) was alsoimproved.Minimal invasive techniques have been developed to decrease the surgical trauma related to theprosthesis implantation. The benefits of minimal-incision surgery might include less surgicaldissection, less blood loss and pain, an earlier return to function, a smaller scar, andsubsequently lower costs. However, there might be a concern about the potential of minimalinvasive techniques for a loss of accuracy. Navigation might help to compensate for thesedifficulties.Mobile bearing prostheses have been developed to decrease the risk of polyethylene wear. Thebenefits might be a better survival and less bone loss during revisions. However, theseprosthesis are technically more demanding, and involve the specific risk of bearing luxation.Again, navigation might help to compensate for these difficulties.MATERIAL AND METHODS: We wanted to combine the theoretical advantages of the threedifferent techniques by developing a navigated, minimal invasive, mobile bearingunicompartmental knee prosthesis. 160 patients have been operated on at our institution withfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]