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Introduction: The purpose of this prospective randomized study was to compare the 2-yearfollow-up penetration of Oxinium versus Metal on polyethylene in a consecutive series of lowfriction total hip arthroplasty.Methods: Between July 2006 and May 2006, 50 patients (27 females and 23 males) with amean age of 60.6 ± 11.4 years (21 to 75) were randomized to receive either Oxinium (25 hips)or Metal (25 hips) femoral head. Other parameters, including the femoral component and the allpolyethylene socket (EtO sterilized), were identical in both groups. The primary criterion forevaluation was linear head penetration measurement using the Martell system.Results: At the time of the 2-year follow-up evaluation, two patients were deceased, one waslost to follow-up, and radiographs were excluded by the software in three patients, leaving 44hips (22 in each study group) with complete clinical and radiologic data available for analysis(median follow-up 2.01 years; 1.9 to 2.3). The median penetration rate was 0.16 mm/year in theOxinium group versus 0.19 mm/year in the Metal group (Mann and Whitney test, p = 0.76).When using the one-year follow-up radiograph as the baseline (limiting the effect of creep),wear was 0.066mm/year in the Oxinium group versus 0.19 in the Metal group (Mann andWhitney test, p = 0.38).Discussion and Conclusion: This study demonstrated a reduction in the yearly linear wear ofEtO sterilized polyethylene when using an Oxinium femoral head when compared to metal.Although the difference was not statistically significant, longer follow-up is necessary toevaluate the clinical significance of such a reduction.Saturday, October 9, 2010, 13:30-14:20Session B20: Hip ArthroplastyMid-Term Results of a Cementless Dual Mobility Socket in Primary THA:Concerns With the 3rd Articulation*Moussa Hamadouche - Hopital Cochin, APHP, Paris 5 - Paris, FranceBertrand Bouxin - Cochin - Paris, FranceHerve Arnould - Bourg en Bresse - Bourg en Bresse, France*Email: Moussah@club-internet.frIntroduction: Several devices based upon the dual mobility (DM) concept have recently beenFDA approved. However, little is available on the efficiency of current DM on THA instabilityprevention, and on specific complications. The aim of this retrospective study was to report onthe minimal 5-year follow-up results of a cementless DM socket.Methods: Between January 2000 and June 2002, 168 primary consecutive non selected THAswere performed in 92 females and 76 males. The average age at surgery was 67.3 years. Asingle DM socket design was used (Tregor, Aston Medical, France) consisting of a Ti-sprayedand HA-coated CoCr shell with a highly polished inner surface articulating with a mobileintermediate polyethylene component. The opening diameter of the mobile insert was 6%smaller than that of the femoral head. In 115 hips, the modular femoral head completelycovered the Morse taper, whereas a long-neck option leaved the base of the Morse taperfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]