Instruments for shaping distal femoral and proximal tibial surfaces

Instruments for shaping the distal femur for knee replacement surgery where the femur anterior condyles have been removed leaving a flat surface that is parallel to the femur intramedullary channel, comprising 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 from a flat undersurface of said femoral alignment guide body and is for insertion into a hole drilled in the distal femur to intersect the femur intramedullary channel;

• and a distal femoral cutting guide that includes a body with means for securing it to said femoral alignment guide at an angle thereto whereby a cutting guide slot means of said distal femoral cutting guide is perpendicular or at a right angle to the patient's mechanical axis, the distal femoral cutting guide further including a pivot pin means that extends from a body of said distal femoral cutting guide for fitting in a pivot hole formed in the femoral alignment guide and a pluralty of hole means formed in a side of said femoral alignment guide body that is at a right angle to said femoral alignment guide flat undersurface, each said hole means angled from the vertical, progressively from larger to smaller or smaller to larger, and straight pin means for fitting through one of the hole means and for securing in an appropriate recess in said femoral alignment guide body to join together said femoral alignment guide and distal femoral cutting guide.

An instrument for shaping the proximal tibia for knee replacement surgery comprising, a tibial cutting guide that includes 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 that is bent at an angle of ten degrees (10.degree.) to the vertical towards the proximal tibia and mounts 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 with the cutting platform means consisting of a rectangular body that is flat on a proximal tibia engaging surface thereof and includes a slot formed therethrough as 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 which rectangular body includes arcuate projections that extend from the opposite body ends in the plane of the flat surface thereof to be positioned above the tibia that are each holed to receive a fastener means therethrough;
• and fastener means for individually fitting through a hole in each said arcuate projection for turning into the tibia.

Instruments for shaping the distal femur for knee replacement surgery comprising a means for sectioning the distal femur at an angle reflective of a right angle to a patient's mechanical axis from a reference to the patient's intramedullary channel, that includes an intramedullary rod for insertion into the patient's intramedullary channel through a hole formed through the distal femur cutting guide means for attachment to said intramedullary rod end for aligning a cutting guide portion thereof to a plane across the distal femur, guiding a saw blade means in resectioning a flat surface thereacross that is perpendicular to the patient's mechanical axis;

• a femoral finishing guide that includes a flat undersurface to evenly rest on the prepared flat distal femur surface and incorporates positioning means that extends from that flat undersurface for squaring said finishing guide such that the intersection of lateral and longitudinal axis thereon will align with the center of the patient's intramedullary channel, the upper surface of said finishing guide including a pair of counter sunk holes that are each spaced equally from the finishing guide center and are aligned on its lateral axis, said counter sunk holes each for receiving a fastener means turned therethrough and into said distal femur, the head thereof turned into the femur to a point that is below the cutting guide upper surface, said finishing guide further including, lateral slots formed across said finishing guide upper surface, exiting said finishing guide undersurface to receive and guide a saw blade means passed therethrough that is operated to resection the anterior and posterior femoral surfaces squaring them to a right angle to said prepared distal femur surface and to cut chamfers from said resectioned surfaces to said distal femur prepared surface, said chamfer lateral slots to intersect said counter sunk holes at the counter sunk upper end of each;
• and the fastener means is a peg means with a head end to travel into said counter sunk hole to below the level of the chamfer lateral slots, said peg means to be removable to allow the holes formed in the distal femur surface to receive projections from a knee prosthesis undersurface securing said knee prosthesis thereto.