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Total knee prosthesis with resurfacing and posterior stabilization capability

  • US 5,358,527 A
  • Filed: 03/20/1992
  • Issued: 10/25/1994
  • Est. Priority Date: 03/22/1991
  • Status: Expired due to Fees
First Claim
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1. A total knee prosthesis capable of providing resurfacing to adjacent ends of existing bone structures, as well as total posterior stabilization to a knee joint, comprising:

  • a) a femoral component including;

    i) a medial condyle having an anterior portion, a distal portion and a posterior portion;

    ii) a lateral condyle having an anterior portion, a distal portion and a posterior portion;

    iii) an anterior patella flange interconnecting the anterior portions of the medial and lateral condyles in parallel, spaced apart relation; and

    iv) cam member means integral with said medial and lateral condyles and located outboard thereof, said cam member means having an anteriorly located concave cam member surface and a posteriorly located convex cam member surface;

    b) a tibial component including;

    i) multi-radius tibias plateau bearing surface means for receiving said medial and lateral condyles for rolling and sliding movement thereon; and

    ii) follower member means integral with said bearing surface means for receiving the cam member surfaces of said cam member means for rotational and sliding movement thereon; and

    c) the cam member surfaces of said cam member means being in contact with said follower member means for substantially the entire flexion range of the knee,wherein said tibial plateau bearing surface means includes;

    a. a medial multi-radius tibial plateau bearing surface means located inboard of said follower means and having an anterior, central and posterior portion for receiving said medial femoral condyle for rolling and sliding movement thereon;

    b. a lateral inboard multi-radius tibial plateau bearing surface means located inboard of said follower means and having an anterior, central and posterior portion for receiving said inboard portion of the lateral femoral condyle for rolling and sliding movement thereon;

    c. a medial outboard-located follower member consisting of a convex follower member surface anteriorly and a concave arcuate follower member surface posteriorly for receiving said anterior concave cam member surface and posterior convex cam member surface of the medial cam member means for rolling and sliding movement thereon, said medial concave arcuate follower member surface being connected to the respective posterior portion of the concave arcuate tibial plateau bearing surface means;

    d. a lateral outboard-located follower member consisting of a convex follower member surface anteriorly and a concave arcuate follower member surface posteriorly for receiving said anterior concave cam member surface and posterior convex cam member surface of the medial cam member means for rolling and sliding movement thereon, said lateral concave arcuate follower member surface being connected to the respective posterior portion of the concave arcuate tibial plateau bearing surface means; and

    e. an interconnecting intercondylar eminence centrally disposed between the medial and lateral multi-radius tibial plateau bearing surface means, said interconnecting eminence being connected to said plateau bearing surface means, and said being removed within the posterior intercondylar portion to provide required clearance for retained anterior and posterior cruciate ligament structures.

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