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Asymmetric femoral prosthesis

  • US 5,549,688 A
  • Filed: 08/04/1994
  • Issued: 08/27/1996
  • Est. Priority Date: 08/04/1994
  • Status: Expired due to Term
First Claim
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1. A knee prosthesis for replacing a patient'"'"'s knee having a mechanical axis defined by a line drawn between the femoral head and the central region of the femoral knee end of the patient, comprising:

  • a) a femoral prosthesis having internal anterior, posterior and distal non-articulating surface portions;

    b) said femoral prosthesis having distal and posterior articulating surface portions, the posterior articulating surface portions comprising lateral and medial condylar surface portions that are positioned at differing distances from said anterior non-articulating surface portion wherein the lateral condylar surface portion is spaced farther from said anterior non-articulating surface portion than the medial condylar surface portion;

    c) a tibial component having concave articulating surfaces that receive the femoral prosthesis articulating surface portions during use;

    d) the femoral articulating surface portions and the tibial articulating surfaces being shaped to define an angle of femoral rotation about the mechanical axis of the patient'"'"'s leg; and

    e) wherein said angle of femoral rotation about the mechanical axis gradually changes when going through a normal range of motion of the patient'"'"'s knee.

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