Hip cup for a hip joint acetabular prosthesis

An acetabular prosthesis comprising an outer metallic shell having an outer bone engaging surface and a conically shaped inner surface defining shell cavity;

• an insert including, in combination, a metallic jacket, a plastic liner and a threaded ring;
• said jacket having an outer surface configured to engage said shell cavity and an inner jacket surface forming a jacket cavity defining a crown end and an opposite open end, and wherein the inner jacket, at a peripheral edge adjacent the open end, has internal threads to mate with aid threaded ring;
• and
• said plastic liner having a part spherical inner liner surface adapted to engage an articulating joint element and an outer liner surface configured to be pressure clamped within the jacket cavity and locked therein upon securing the threaded ring to the internal threads of the jacket, and wherein the insert, in combination, is then fixedly secured within the metallic shell by a retaining means.