Patent ID: 8034113
Filing Date: 2011-10-11
Classification: A61B,A61F

Abstract:
1. A joint prosthesis comprising: a first implant member having a first front articulating surface portion of substantially hyperbolic paraboloid configuration and a first rear concave bone fixation surface portion to be fitted to an end of a first bone; a second implant member having a second front articulating surface portion including mutually perpendicular intersecting concave and convex surfaces defining alternate upwardly and downwardly curved projections complementary to and engageable with said first front articulating surface portion and including a second rear convex bone fixation surface portion to be fitted to an end of a second bone that articulates with the first bone; and a retaining member configured to releasably link together the first and second implant members and prevent movement therebetween, wherein said first and second bone fixation surface portions each include two or more porous protuberant members extending transversely to said bone fixation surface portions, and wherein the retaining member comprises at least a first and second post positioned to be at least partially inserted into the porous protuberant members on the first bone fixation surface portion and at least a third and fourth post positioned to be at least partially inserted into the porous protuberant members on the second bone fixation surface portion, the posts and protuberant members having parallel longitudinal axes to allow each post to be inserted into its respective protuberant member to link together the first and second implant members and, after implantation, allow each post to be slidably withdrawn from its respective protuberant member to allow the first and second implant members to articulate.