Joint replacement implant

Abstract

An implant for one of partial and total replacement of an articulating joint between a first bone and a second bone. The implant has a joint component implant including a body and a head, the body including a first region spaced from the head and a second region proximate the head, the head including a convex bearing surface. At least a portion of the first region has a textured surface, the textured surface constructed of a foam metal material that is configured to promote bone in-growth into the textured surface, the body constructed of a metallic material and configured for attaching to the first bone, the first region tapering from a proximal end adjacent the second region toward a distal end.

What is claimed is: 
     
         1 . An implant for one of partial and total replacement of an articulating joint between a first bone and a second bone, the implant comprising:
 a joint component implant including a body and a head, the body including a first region spaced from the head and a second region proximate the head, the head including a convex bearing surface, at least a portion of the first region having a textured surface, the textured surface constructed of a foam metal material that is configured to promote bone in-growth into the textured surface, the body constructed of a metallic material and configured for attaching to the first bone, the first region tapering from a proximal end adjacent the second region toward a distal end.   
     
     
         2 . The implant of  claim 1 , wherein the second region is comprised of a joining region, the joining region including multiple surfaces. 
     
     
         3 . The implant of  claim 1 , wherein the bearing surface is substantially smooth and the joint component implant is comprised of a male implant. 
     
     
         4 . The implant of  claim 3 , further comprising:
 a female implant including a concave bearing surface, the concave bearing surface configured to serve as the bearing surface against which the convex bearing surface of the joint component articulates in an implanted configuration.   
     
     
         5 . The implant of  claim 4 , wherein the female implant has a substantially annular shape. 
     
     
         6 . The implant of  claim 4 , wherein the female implant is configured for attaching to the second bone. 
     
     
         7 . The implant of  claim 4 , wherein the concave bearing surface is constructed of a polymeric material. 
     
     
         8 . The implant of  claim 7 , wherein the polymeric material is comprised of polyethylene. 
     
     
         9 . The implant of  claim 1 , wherein the joint component implant is configured for implanting in one of the hip, knee and shoulder. 
     
     
         10 . The implant of  claim 1 , wherein the convex bearing surface is comprised of a ceramic material. 
     
     
         11 . The implant of  claim 1 , wherein the entire first region includes the textured surface. 
     
     
         12 . An implant for one of partial and total replacement of an articulating joint between a first bone and a second bone, the implant comprising:
 a joint component implant including a body and a head, the body including a first region spaced from the head and a second region proximate the head, the head including a convex bearing surface, at least a portion of the first region having a textured surface, the textured surface constructed of a foam metal material and being configured to promote bone in-growth into the textured surface, the body constructed of a metallic material, the first region configured for attaching to the first bone, the first region having a proximal end portion adjacent the second region and a distal end portion spaced from the second region, the proximal end portion having a first thickness and the distal end portion having a second thickness, the first thickness being greater than the second thickness; and   a female implant including a concave bearing surface, the concave bearing surface configured to serve as the bearing surface against which the convex bearing surface of the joint component articulates in an implanted configuration.   
     
     
         13 . The implant of  claim 12 , wherein the concave bearing surface is constructed of a polymeric material. 
     
     
         14 . The implant of  claim 13 , wherein the polymeric material is comprised of a polyethylene material. 
     
     
         15 . The implant of  claim 12 , wherein the female implant includes a fixation surface, the fixation surface constructed of a foam metal material, the fixation surface configured to promote bone in-growth. 
     
     
         16 . The implant of  claim 12 , wherein the female implant has a substantially annular shape. 
     
     
         17 . The implant of  claim 12 , wherein the first region tapers from the proximal end portion toward the distal end portion. 
     
     
         18 . The implant of  claim 12 , wherein the second region includes multiple surfaces. 
     
     
         19 . The implant of  claim 18 , wherein the multiple surfaces are configured so that an inserter can be used to attach the joint component implant to the first bone. 
     
     
         20 . An implant for one of partial and total replacement of an articulating joint between a first bone and a second bone, the implant comprising:
 a first component implant including a body and a head, the head including a generally smooth, substantially spherical bearing surface constructed of a ceramic material, the body including a first region and a second region, the first region having a textured surface constructed of a foam metal material that is configured to promote bone in-growth, the first region having a proximal end portion adjacent the second region and a distal end portion spaced from the second region, the body tapering from the proximal end portion toward the distal end portion, the body constructed of a metallic material and being configured to attach to the first bone; and   a second component implant including a concave bearing surface, the concave bearing surface configured to mate with and articulate against the substantially spherical bearing surface of the first component implant in an implanted configuration, the second component implant having a substantially annular shape.   
     
     
         21 . The implant of  claim 20 , wherein the second region is comprised of a joining region having multiple surfaces. 
     
     
         22 . The implant of  claim 20 , wherein the first region tapers to a point at a distal end on the distal end portion. 
     
     
         23 . The implant of  claim 20 , wherein the second component implant includes a fixation surface opposite the concave bearing surface, the fixation surface constructed of a foam metal material. 
     
     
         24 . An implant for one of partial and total replacement of an articulating joint between a first bone and a second bone, the implant comprising:
 a joint component implant including a body and a head, the head including a substantially smooth first bearing surface constructed of a polymeric material, the body including a textured surface constructed of a foam metal material that is configured to promote bone in-growth, the body including a first region spaced from the head and a second region proximate the head, the first region tapering from a proximal end portion adjacent the second region and a distal end portion, the body constructed of a metallic material and being configured to attach to the first bone; and   an articulating surface area implant including a substantially smooth second bearing surface, the articulating surface area implant constructed of a metallic material, the second bearing surface configured to mate with and articulate against the first bearing surface in an implanted configuration.   
     
     
         25 . The implant of  claim 24 , wherein the articulating surface area implant has a substantially annular shape. 
     
     
         26 . The implant of  claim 24 , wherein the head is substantially spherical and the first bearing surface is substantially convex. 
     
     
         27 . The implant of  claim 24 , wherein the first region includes a fixation mechanism thereon. 
     
     
         28 . The implant of  claim 24 , wherein the first region tapers to a point at the distal end. 
     
     
         29 . The implant of  claim 24 , wherein the head has a shape the provides the smooth first bearing surface. 
     
     
         30 . The implant of  claim 24 , wherein the body includes an expandable portion to facilitate fixation of the joint component implant to the first bone.