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A spherical cemented polyethylene-alumina composite cup, ABS cup (Kyocera, Kyoto, Japan), was developed to obtain stability between the alumina cup and bone cement. There were two designs for this cup: (A) one is the ABS cup without a flange and (B) the other is the ABS cup with a flange. (C) A cross section of the ABS cup is shown. The thickness of the alumina inlay is fixed at 4 mm in any size of acetabular component.
