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this system. The 81 patients with more than 2 year follow-up have been re-examined.Complications have been recorded. The clinical results have been analyzed according to theKnee Society Scoring System. The subjective results have been analyzed with the Oxford KneeQuestionnaire. The accuracy of implantation has been analyzed on post-operative anteroposteriorand lateral long leg X-rays. The 2-year survival rate has been calculated.RESULTS: We observed 8 complications related to the implant or the operative technique : 2cases of meniscus instability (1 revision to TKR, 1 bearing exchange); 2 cases of tibia loosening(revised to TKR), 2 cases of femoral loosening (revised to TKR), 1 case of lateral diseaseprogression ( revised to TKR), 1 case of unexplained pain syndrome (revised to TKR).The mean Knee Score was 93 points, 44% had the maximum of 100 points, and only 10% haveless than 85 points. The mean pain score was 48 points/50. The mean flexion angle was 128°,and 60% had at least 130° of knee flexion. The mean Function Score was 97 points, 84% havethe maximum of 100 points, and only 5% had less than 85 points. The mean Oxford KneeQuestionnaire score was 19 points (best result: 12 points, worst result: 60 points).Expected limb axis correction was obtained in 77% of the cases. 62% of the cases had anoptimally implanted prosthesis for all studied criteria. The 2-year survival rate was 97%.DISCUSSION: Most of the revision cases were related to technical difficulties during thedevelopment phase. Fixation of the implant has been improved, and some imprecise steps of thesoftware have been corrected. Since these changes occurred, no severe early complicationrelated to implant or software has been observed. The current implant is considered reliable, andthe current minimal invasive navigated technique is considered reliable as well.FiguresFigure 1Thursday, October 7, 2010, 7:30-8:20Session B1: Computer Navigation in TKANavigated Total Knee Prosthesis Exchange. a Comparative Study WithConventional Technique.*Jean-Yves Jenny - University Hospital Strasbourg - Illkirch, FranceYann Diesinger - University Hospital Strasbourg - Illkirch, France*Email: Jean-yves.jenny@chru-strasbourg.frINTRODUCTION: Revision total knee replacement (TKR) is a challenging procedure,file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]