Patent ID: 8715359

Claim:
A joint prosthesis comprising: a first metal component having a solid metal portion with a solid metal articulation surface and a second solid metal surface opposite the solid metal articulation surface, the first metal component further having a porous metal portion along the second solid metal surface, the porous metal portion including a bone-engaging surface opposite from the second solid metal surface; a bearing having an articulation surface shaped to bear against the articulation surface of the first metal component and an opposite surface; a second metal component having a solid metal portion with a solid metal mounting surface and a second solid metal surface opposite the solid metal mounting surface, the second metal component further having a porous metal portion along the second solid metal surface, the porous metal portion including a bone-engaging surface opposite from the second solid metal surface; and an extension extending beyond the bone-engaging surface of one of the porous metal portions of one of the metal components to an exposed end, the extension having an opposite end received in a recess in the second solid metal surface of the solid metal portion of one of the metal components, an exposed outer surface and a length from the opposite end to the exposed end; wherein: the extension is configured for stabilizing the metal component when implanted in a bone of a patient; the length of the extension from the bone-engaging surface to the exposed end consists of titanium foam having a void space of at least 65% by volume; the solid metal portion of the metal component from which the extension extends comprises a titanium alloy; and the titanium foam of the extension comprises commercially pure titanium.