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Instruments for shaping distal femoral and proximal tibial surfaces

  • US 4,759,350 A
  • Filed: 10/17/1986
  • Issued: 07/26/1988
  • Est. Priority Date: 10/17/1986
  • Status: Expired due to Term
First Claim
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1. A system of instruments for shaping the distal femur and proximal tibia surfaces for knee replacement surgery comprising, for preparing the distal femur:

  • a femoral alignment guide having a body for attachment across the distal femur, which body includes means for mounting other instruments thereto and an intramedullary rod means that extends therefrom for insertion into a hole drilled in the distal femur to intersect the femur intramedullary channel for referencing said femoral alignment guide positioning to said intramedullary channel;

    an anterior femoral cutting guide means for attachment to said femoral alignment guide that includes a saw blade guide means for guiding travel of a saw blade operated to cut across the anterior femoral condyles in a plane that is parallel to the patient'"'"'s intramedullary channel;

    a distal femoral cutting guide that includes, a body with means for securing it to said femoral alignment guide at an angle from a right angle therebetween such that a saw blade guide means formed through said body will be at a right angle to the patient'"'"'s mechanical axis that includes a pivot pin means that extends from the body of said distal femoral cutting guide for fitting in a pivot hole formed in the femoral alignment guide and a plurality of hole means formed in a side of the body of said femoral alignment guide, each said hole means angled from the vertical, progressively from larger to smaller or smaller to larger, and straight pin means for fitting through a selected hole means and for securing in an appropriate recess in said femoral alignment guide body;

    means for securing said body of said distal femoral cutting guide to the distal femur surface that is provided by removal of said anterior condyles, and means for shaping to square the anterior and posterior condyles to the plane of the distal femur after the end thereof has been resectioned to a plane that is at a right angle to the patient'"'"'s mechanical axis; and

    , for preparing the proximal tibia;

    a tibial cutting guide consisting of, a sleeve that is open on one end to receive a tube telescoped therein and includes a spike means on the other end thereof for securing that sleeve end into the tibia at the ankle;

    means for connecting said tube end that is opposite to said telescoped coupling into the tibia near the proximal tibia;

    means for releasably maintaining the positioning of said sleeve relative to said tube;

    rod means mounting a cutting platform means on one end that is telescoped into said tube at its opposite end;

    means for releasably maintaining the positioning of said rod means relative to said tube; and

    said cutting platform means consists of a body that includes a saw guide for aligning a saw blade to the proximal tibia end so as to cut across that bone to provide a flat surface thereacross.

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