Prosthetic knee implantation

• US 4,646,729 A
• Filed: 12/19/1985
• Issued: 03/03/1987
• Est. Priority Date: 02/18/1982
• Status: Expired due to Term

• Current Assignee: Stryker Technologies Corporation
• Original Assignee: Howmedica Inc.
• Inventors: Krackow, Kenneth A., Hungerford, David S., Kenna, Robert V.
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/811,020
• Time in Patent Office: 439 Days
• Field of Search: 128/1 R, 128/303, 128/305, 128/92 E, 128/92 EB, 128/92 C, 128/92 H
• US Class Current: 606/88
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia

Abstract

A prosthetic knee is implanted after cutting the femor and tibia in the proper manner with the aid of instruments which include axial alignment guides and a series of cutting jigs.

Claims

1. In a method of preparing a knee for prosthetic knee implantation wherein bone cuts are made to juxtaposed portions of the femur and tibia to generally conform those surfaces for having a prosthetic knee secured thereto, the improvement being initially mounting a distal femoral cutting jig to the distal end of the femur, securing an alignment rod to the distal femoral cutting jig to establish proper varus-valgus and flexion-extension alignment therewith, locking the distal femoral cutting jig to the femur after proper alignment therewith, cutting the distal end of the femur for the transverse distal femoral cut through use of a guide surface on the distal femoral cutting jig, and making the remaining bone cuts of the femur and tibia.

2. In the method of claim 1, including mounting a femoral drill jig to the distal end of the femur for determining the medial/lateral and rotational positioning of the femoral component of the prosthesis, using the femoral drill jig for making positioning holes in the distal end of the femur, removing the femoral drill jig, mounting an anterior-posterior femoral cutting jig to the distal end of the femur with the aid of locking members secured to the positioning holes, making the anterior and posterior femoral bone cuts by using guide surfaces on the anterior-posterior femoral cutting jig.

3. In the rethod of claim 2, including mounting a femoral spacer/tensor jig to the distal end of the femur and mounting a tibial cutting jig to the femoral spacer/tensor jig, mounting an axial alignment guide to the femoral spacer/tensor jig, positioning an alignment guide pin to the axial alignment guide for alignment with the center of the ankle joint, and transversely cutting the tibial bone with the aid of a guide surface on the transverse tibial cutting jig.

4. In the method of claim 3, including mounting a chamfer cutting jig to the distal end of the femur, and making anterior and posterior cuts of the femur with the aid of guide surfaces on the femoral chamfer cutting jig.

5. In the method of claim 4, including mounting a tibial positioning/fixation jig to the tibia, and checking the rotational and medial-lateral position of the tibia by the aid of an axial alignment guide pin positioned in the tibial positioning/fixation jig.

6. In the method of claim 1, including mounting a femoral spacer/tensor jig to the distal end of the femur and mounting a tibial cutting jig to the femoral spacer/tensor jig, mounting an axial alignment guide to the femoral spacer/tensor jig, positioning an alignment guide pin to the axial alignment guide for alignment with the center of the ankle joint, and transversely cutting the tibial bone with the aid of a guide surface on the transverse tibial cutting jig.

7. In the method of claim 1, including mounting a chamfer cutting jig to the distal end of the femur, and making anterior and posterior cuts of the femur with the aid of guide surfaces on the femoral chamfer cutting jig.

8. In the method of claim 1, including mounting a tibial positioning/fixation jig to the tibia, and checking the rotation and medial-lateral position of the tibia by the aid of an axial alignment guide pin positioned in the tibial positioning/fixation jig.