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Is the Frecnh Paradox a Reality? Long Term Survival and Migration of theCharnley-Kerboull Cemeneted Line-to-LineFiras El Masri - Cochin - Paris, FranceLuc Kerboull - - ,Marcel Kerboull - - ,Jean Pierre Courpied - Cochin - Paris, France*Moussa Hamadouche - Hopital Cochin, APHP, Paris 5 - Paris, France*Email: Moussah@club-internet.frIntroduction: The purpose of this study was to evaluate the in vivo migration patterns of apolished femoral component cemented line-to-line using EBRA –FCA.Methods: The series included 164 primary consecutive THAs performed in 155 patients with amean age of 63.8 years. A single prosthesis was used combining an all-polyethylene socket anda 22.2 mm femoral head. The monoblock double tapered femoral component made of 316-Lstainless steel had a highly polished surface (Ra 0.04 micron) and a quadrangular section(Kerboull® MKIII, Stryker). The femoral preparation included removal of diaphysealcancellous bone to obtain primary rotational stability of the stem prior to the line-to-linecementation. Stem subsidence was evaluated using EBRA-FCA software which accuracy isbetter than ± 1.5 mm (95% percentile), with a specificity of 100% and a sensitivity of 78% fordetection of migration of more than 1.0 mm, using RSA as the gold standard.Results: At the minimum 15-year follow-up, 73 patients (77 hips) were still alive and had notbeen revised at a mean of 17.3 ± 0.8 years, 8 patients (8 hips) had been revised for highpolyethylene wear associated with periacetabular osteolysis, 66 patients (69 hips) weredeceased, and 8 patients (10 hips) were lost to follow-up. Among the 8 revision procedures, thefemoral component was loose in 3 cases. A total of 1689 radiographs were digitized of which263 were excluded by the software for lack of comparability, leaving 142 hips with adequatefollow-up evaluation data. At last follow-up, the mean subsidence of the entire series was 0.63± 0.49 mm (0 – 1.94 mm). When using a 1.5 mm threshold, 4 of the 142 stems were consideredto have subsided.Thursday, October 7, 2010, 9:00-9:50Session A2: Alternate Bearings in THA 2Oxinium Versus Metal on Polyethylene: A Prospective RandomizedEvaluation of the Penetration Rate at Two-Year Follow-Up.El Hage Samer - Cochin, Paris 5 - Paris, FranceFrederic Zadegan - Cochin - 75014, FranceJean Pierre Courpied - Cochin - Paris, FranceMichel Mathieu - Cochin - Paris, France*Moussa Hamadouche - Hopital Cochin, APHP, Paris 5 - Paris, France*Email: Moussah@club-internet.frfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]