Patent ID: 6152961
Filing Date: 2000-11-28
Classification: A61F

Abstract:
An acetabular cup prosthesis, comprising:a shell component having a generally convex bone-engaging outer surface and a generally concave inner surface with a groove formed in the inner surface thereof and extending about at least a portion of the circumference of the inner surface of the shell component;a liner component having an inner, concave surface and an outer, convex surface with a shape complementary to and matable within the inner surface of the shell component, the liner component having a polar region and an equator region;at least one positive surface feature formed on the outer surface of the liner component, the at least one positive surface feature being selectively matable with the groove of the shell and having (i) an end wall spaced apart from the outer, convex surface and (ii) opposed side walls connecting the end wall to the outer, convex surface of the shell component wherein the opposed side walls comprise a superior side wall and an inferior side wall, the superior side wall forming a downwardly sloping acute angle with an equatorial line drawn parallel to an equatorial axis of the liner;at least one anti-rotation tab member formed on the outer surface of the liner component, adjacent to the at least one positive surface feature; andat least one recess formed in the inner surface of the shell component the at least one recess having a size and shape complementary to the at least one anti-rotation tab member such that each of the at least one recesses is effective to matingly engage one of the at least one anti-rotation tab members.