Patent ID: 6299647
Filing Date: 2001-10-09
Classification: A61F

Abstract:
A head-receiving acetabular cup for a ball and socket hip joint implant, said cup comprising a body; an articular surface; and a mountable back surface; said cup being monolithically made from plastic; said articular surface, when the head-receiving cup is suitably mounted in suitable receiving stock, mating in gliding contact with a smooth external surface of a corresponding ball joint head of a ball and socket head-containing femoral joint component when said corresponding component is also suitably mounted in suitable receiving stock; wherein:said body includes generally opposing, angled cut-out margins to anterio-inferior and postero-inferior marginal rim extensions of said body which can accommodate an anterior anatomical indentation of hip socket containment and engender avoidance of premature abutment of a postero-inferior aspect of the margin against an opposing femoral neck of said femoral joint component or an opposing femoral bone neck, with external rotation and/or adduction of the hip, which allow a normal, non-dislocating range of unobstructed external and internal rotation of the hip joint;the mountable back surface includes a plurality of small, widely dispersed cement spacer elevation members extending from the back surface to provide for an appropriately thick cement mantle; andwhich cup further includes a snap-fitting hood arrangement of the head-restraining marginal outlet of the acetabular cup, which includes a marginally extended continuation of a superior one half or so of cup containment that is of a sufficient magnitude to reduce an overall dimension of a socket outlet of the cup to less than a hemispherical embrace of the femoral head component.