Patent ID: 8197550
Filing Date: 2012-06-12
Classification: A61F

Abstract:
1. An acetabular cup for implantation into an acetabulum of a patient, the acetabular cup comprising: an integrally formed shell having an outer hemispherical portion comprising a first porous metal layer adapted to receive bone ingrowth after implantation, an inner hemispherical portion comprising a second porous metal layer; and a thin solid metal intermediate hemispherical portion defining a non-porous and continuous barrier between said outer and inner hemispherical portions; at least one bone screw adapted to be intra-operatively inserted through the shell from the inner portion to the outer portion, the at least one bone screw adapted to pierce the barrier; and a bearing liner affixed to the inner portion; wherein the barrier inhibits wear debris particles from migrating from the inner portion to the outer portion; wherein the outer portion defines a radial rim, wherein the intermediate portion includes an annular collar affixed around the radial rim; wherein the intermediate portion has a thickness less than 50% of either of a thickness of the inner portion and a thickness of the outer portion; wherein the porosity of the first porous metal layer is distinct from the porosity of the second porous metal layer.