The titanium alloy (TiAl6V4MUTARS® RS Cup is a modular revision device which is flattened at the pole. Initial primary stability is gained via a wedge-shaped ischial flange and an arch-shaped illiac flange with screw holes. The ischial flange is embedded within a slot (prepared with a specially-shaped osteotome) in the ischium. The iliac flange is contoured to fit the available bony anatomy before being secured in place with 6.5mm cancellous screws. The bone-facing convex side of the cup has a porous EPORE® ingrowth structure for secondary long-term osseointegration.