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Bimetal tibial component construct for knee joint prosthesis

  • US 7,513,912 B2
  • Filed: 03/13/2007
  • Issued: 04/07/2009
  • Est. Priority Date: 05/14/1998
  • Status: Expired due to Fees
First Claim
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1. A prosthetic tibial component for a prosthetic total knee joint, said component comprising two constructs, one comprising a metal base construct adapted to engage a bone and the other comprising a polyethylene bearing construct adapted to attach to said metal base construct and adapted to articulate with a prosthetic femoral component on an opposing side of the joint, wherein said metal base construct is composed of two different metals, a first of said metals being adapted to engage the bone surface and a second of said metals being adapted to engage said polyethylene bearing construct, with the first metal being selected so as to provide a superior bone-engaging face, and the second metal being selected so as to provide a superior polyethylene-engaging face;

  • wherein said metal base construct comprises;

    a base plate having a first of the different metals on a first surface thereof for engagement with the tibia;

    a stem extending from the first surface and adapted to be embedded in the tibia;

    posts extending from the first surface of said base plate for connecting engagement with the tibia; and

    a connector disposed on a second surface of said base plate for connection to a complementary connector on the polyethylene bearing construct;

    wherein said first metal comprises a selected one of titanium, a titanium alloy, tantalum, a tantalum alloy;

    said first metal further comprises a material which is highly biocompatible and which exhibits good bone ingrowth properties; and

    wherein said second metal comprises a selected one of CoCrMo, a cobalt based alloy, a stainless steel, and a zirconium based alloy; and

    wherein said second metal comprises a material which has relatively high hardness and which is scratch resistant.

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