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Obviously, the composite material used for the acetabular liner is not comparable to traditionalceramic materials. The softer composite material seems to be very sensitive to third bodieswhereas the conventional aluminium oxide material was not significantly affected by thirdbodies embedded in the counterface material.Discussion and ConclusionImplants with a porous metal structure can yield metallic third bodies. Those metal fragmentscan cause significant third-body damage, such as deep scratches and indentations, to bearingsurfaces in particular if softer materials are involved as bearing surfaces.In porous metal surface THA, ceramic-on-ceramic bearing couples should be considered due totheir superior hardness to prevent excessive wear, including debris embedment and scratchingof the bearing surfaces, especially in revision cases.Figure 1: Surface structure of Spongiosa Metal.Figure 2. Preoperative radiograph showing numerous metal fragments (1-2 mm, arrow) in theperiarticular area.Figure 3: Photograph showing indentations and scratches in the inferior region of the acetabularliner surface.FiguresPoster: 51Effect of Joint Laxity on Polyethylene Wear in Total Knee Replacement*J. Philippe Kretzer - Laboratory of Biomechanics and Implant Research, University ofHeidelberg - Heidelberg, GermanyEike Jakubowitz - Heidelberg University Hospital - Heidelberg, GermanyRobert Sonntag - Heidelberg University Hospital - Heidelberg, GermanyJoern Reinders - Laboratory of Biomechanics and Implant Research, University of Heidelberg -Heidelberg, GermanyChistain Heisel - Arcus Sportklinik - Pforzheim, GermanyMarc Thomsen - DRK Klinik - Baden-Baden, GermanyAbstract*Email: kretzer@implantatforschung.deExperimental simulator studies are frequently performed to evaluate wear behavior in total kneereplacement. It is vital that the simulation conditions match the physiological situation asclosely as possible. To date, few experimental wear studies have examined the effects of jointfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]