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Aseptic loosening due to wear particles is the most important longterm complication after total hip arthroplasty. One concept to improve acetabular fixation is to focus on long-term preservation of bone at the equatorial area of uncemented acetabular components. This goal may be achieved by constructing acetabular components with an equatorial area which is rougher than the dome so that stressshielding is less likely to occur within this area. This could potentially result in improved sealing of the implant-bone interface against wear particles and improved long-term fixation of acetabular implants. In this study we tested the primary press-fit quality of such uncemented acetabular components. With the chosen experimental setting we found that an uncemented acetabular component with a rough equatorial area and a smooth dome may have a press-fit quality comparable to that of a fully roughened acetabular component This finding supports the idea to construct acetabular components with equatorial coating from the perspective of primary press-fit. Marius von Rnoch ' , Robin Büscher, A n d reas Piotrowski, Guido Saxler, Alfons Fischer, Franz Löer

Push-Out Testing of Cementless Acetabular Components with Equatorial Roughened Surface