Fixation of bone implants

Abstract

The present invention provides an orthopaedic implant including an articulating tray, a support tray connected to the articulating tray and a bone ingrowth layer connected to the support tray. The articulating tray has an articulating surface and an interface surface opposed to the articulating surface. The support tray has a first connecting surface that is connected to the interface surface and a second connecting surface that is opposed to the first connecting surface and connected to the bone ingrowth layer. Also provided is an orthopaedic implant with an articulating component and a body component connected to the articulating component. The articulating component has an articulating surface and an interface surface opposed to the articulating surface. The body component has a first surface connected to the interface surface, a second surface opposed to the first surface and at least one protrusion that extends away from the second surface.

What is claimed is: 
     
         1 . An orthopaedic implant, comprising:
 an articulating tray having an articulating surface and an interface surface opposed to said articulating surface;   a support tray connected to said interface surface and having a first connecting surface and a second connecting surface opposed to said first connecting surface, said first connecting surface being connected to said interface surface; and   a bone ingrowth layer connected to said second connecting surface.   
     
     
         2 . The orthopaedic implant according to  claim 1 , wherein said bone ingrowth layer includes a plurality of pores formed throughout that are configured to encourage bone ingrowth into said bone ingrowth layer. 
     
     
         3 . The orthopaedic implant according to  claim 2 , wherein said bone ingrowth layer has at least one biologically active substance residing within at least one of said plurality of pores. 
     
     
         4 . The orthopaedic implant according to  claim 3 , wherein said support layer has a reservoir formed therein configured to hold at least one therapeutic agent and a plurality of openings formed through said second connecting surface, said plurality of openings fluidly connecting said reservoir to said bone ingrowth layer. 
     
     
         5 . The orthopaedic implant according to  claim 4 , wherein said support layer has an exposed surface with a port formed through said exposed surface to said reservoir. 
     
     
         6 . The orthopaedic implant according to  claim 2 , wherein said orthopaedic implant is configured as one of a femoral implant and a tibial implant. 
     
     
         7 . The orthopaedic implant according to  claim 5 , wherein said support layer is separably connected to at least one of said interface surface and said bone ingrowth layer. 
     
     
         8 . The orthopaedic implant according to  claim 5 , further comprising a polymer retention layer connecting said interface surface to said first connecting surface. 
     
     
         9 . An orthopaedic implant, comprising:
 an articulating component having an articulating surface and an interface surface opposed to said articulating surface; and   a body component connected to said interface surface and having a first surface, a second surface opposed to said first surface and at least one protrusion, said first surface connected to said interface surface and said at least one protrusion extending away from said second surface and configured to be biased toward an anatomy structure by a tensile force.   
     
     
         10 . The orthopaedic implant according to  claim 9 , wherein said body component includes a support component connected to said articulating component and a bone fixation component connected to said support component. 
     
     
         11 . The orthopaedic implant according to  claim 10 , wherein said at least one protrusion is angled relative to said second surface. 
     
     
         12 . The orthopaedic implant according to  claim 10 , wherein said at least one protrusion is an integral part of at least one of said support component and said bone fixation component. 
     
     
         13 . The orthopaedic implant according to  claim 10 , further comprising a tensioning member connected to said at least one protrusion. 
     
     
         14 . The orthopaedic implant according to  claim 13 , wherein said tensioning member includes an anchor and a tension transmitter connecting said anchor to said at least one protrusion. 
     
     
         15 . The orthopaedic implant according to  claim 10 , wherein said at least one protrusion has a bore with an entrance formed therethrough. 
     
     
         16 . The orthopaedic implant according to  claim 15 , wherein said at least one protrusion has a locking feature formed one of inside and outside said bore adjacent to said entrance. 
     
     
         17 . The orthopaedic implant according to  claim 16 , further comprising a tensioning member connected to said locking feature. 
     
     
         18 . The orthopaedic implant according to  claim 13 , further comprising a bone adhesive connected to said second surface. 
     
     
         19 . A method of implanting an orthopaedic implant, comprising the steps of:
 providing an orthopaedic implant including an articulating component having an articulating surface and an interface surface opposed to said articulating surface and a body component connected to said interface surface having a first surface, a second surface opposed to said first surface and at least one protrusion, said first surface being connected to said interface surface and said at least one protrusion extending away from said second surface;   preparing an anatomical site for implantation;   placing said orthopaedic implant at the prepared anatomical site; and   providing a tensile force to said at least one protrusion to force said orthopaedic implant into said prepared anatomical site.   
     
     
         20 . The method according to  claim 19 , wherein said preparing step includes resectioning said anatomical site and creating at least one bore through said anatomical site that provides access to said protrusion when said orthopaedic implant is placed within said prepared anatomical site.