Patent ID: 8021432

Claim:
An acetabular cup assembly implantable at an acetabular socket, the acetabular cup assembly comprising: an acetabular cup having a partially spherical outer bone engaging surface, an opposite inner concave surface, and having a uniform thickness; a bearing liner having a partially spherical outer surface adapted to engage the inner concave surface of the acetabular cup; at least three spacers, each of said at least three spacers having a piercing portion and a body portion, said body portion formed of porous metal and including a radial support surface, said porous metal adapted to receive bone ingrowth through interstitial space at pores defined therein, said radial support surface including a concave acetabular cup supporting surface that engage and support said outer bone engaging surface of said acetabular cup, each of said at least three spacers further comprising a piercing portion extending from said radial support surface and adapted to be advanced into the acetabular socket, said at least three spacers having distinct heights in an implanted position, said distinct heights measured from said respective body portions to said corresponding piercing portions wherein each of said at least three spacers is separate from and independently movable relative to said acetabular cup and do not extend through said outer bone engaging surface of said acetabular cup, each of said at least three spacers configured to be selectively located at a desired position around the acetabular socket and adapted to collectively create a substantially hemispherical landing area that engages and supports said outer bone engaging surface of said acetabular cup to bridge a gap between the acetabular socket and said acetabular cup in said implanted position; and filler disposed between said acetabular cup and the acetabular socket in areas adjacent to said at least three spacers such that said at least three spacers and said filler collectively provide a continuous support surface adapted to support said acetabular cup at said bone engaging surface.