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Prosthetic device adapted to promote bone/tissue ingrowth

  • US 4,479,271 A
  • Filed: 10/26/1981
  • Issued: 10/30/1984
  • Est. Priority Date: 10/26/1981
  • Status: Expired due to Fees
First Claim
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1. A tibial component for a knee joint prosthesis comprising:

  • (a) a bottom base layer of a porous metal material having an upper base surface, and a lower base surface, defining a thickness of porous material therebetween, said lower base surface adapted to be in direct contact with a prepared bone surface to promote the ingrowth of bone and/or tissue into the porous material, and(b) a top non-metal layer molded onto the upper base surface of the bottom base layer and wherein said non-metal layer has an upper non-metal surface and a lower non-metal surface, wherein said upper non-metal surface is contoured appropriately for use as an articulating bearing surface, and wherein at least a portion of the lower non-metal surface is in direct contact with the upper base surface wherein said portion of the non-metal layer in contact with the upper base surface penetrates into the porous metal of the upper base surface to secure said non-metal layer to the porous base layer, said non-metal material penetrating only partially through the thickness of porous material, leaving the lower portion of the porous layer free to allow for the ingrowth of bone and/or tissue in through the porous lower base surface, and(c) and intermediate metal reinforcing layer disposed between the bottom base layer and the top non-metal layer wherein said reinforcing layer includes at least one opening, therefore allowing the non-metal material to the top layer to fill the at least one opening, and hence contact and penetrate the porous surface of the porous bottom base layer at the opening, and(d) at least one porous metal stem protruding from the lower base surface of the bottom base layer, wherein said outer surface of the protruding stems is adapted to be in direct contact with the prepared bone surface to promote the ingrowth of bone and/or tissue, and wherein each protruding porous metal stem includes a bore therethrough which extends from the distal end of the stem through to the upper surface of the bottom base layer.

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