Instruments for use in knee replacement surgery
First Claim
1. A method of replacing a portion of a knee joint in an animal with an implanted prosthesis comprising:
- a. positioning a first guide relative the distal end of a femur and making a distal femoral cut using said guide;
b. positioning a second guide adjacent a proximal end of a tibia and making a proximal tibial cut using said guide;
c. attaching a spacer element to said second guide and positioning said spacer between said proximal tibia end and distal femur end to provide a spacing between said distal femur end and proximal tibial end when said femur and tibia are in flexion which correlates to the operative thickness of the implanted prosthesis;
d. attaching a guide block having at least two guide bores to said spacer to form a predetermined angle between a guide face of said guide block and the proximal tibial cut;
e. positioning said femur with said distal femoral cut adjacent to said guide face and matching said guide face with said spacer in place;
f. boring at least two mounting bores in the distal femur using said guide bores in said guide block to position said mounting bores;
g. mounting a chamfer cut guide to the distal end of the femur using said mounting bores to position the chamfer cut guide on the femur;
h. cutting at least one femur chamfer cut using said chamfer cut guide to position said cut;
i. attaching a femoral prostheses component along said at least one femur chamfer cut; and
j. attaching a tibial prostheses component along said proximal tibia cut.
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0 Petitions
Accused Products
Abstract
The present invention relates to an instrument and method for performing a partial knee replacement and, in particular, a single condyle replacement method. The instrument includes a tibial mounted platform which has formed thereon a keyed slot for receiving a spacer which spacer is positioned between the femur and tibia of the knee joint being replaced. The spacer receives thereon a positioning element which positioning element includes guides for guiding a drill to drill mounting holes for mounting further instruments used in the knee operation. In particular, the mounting holes are drilled when the femur and tibia are in a predetermined angular relationship with the spacer providing a predetermined spacial relationship. In this way, the mounting holes are properly determined and positioned with respect to the relationship between the femur and tibia. A saw guide is mounted to the mounting holes and used to guide a saw when cutting the anterior chamfer, the posterior chamfer and the posterior femoral cut. A further drill guide is then mounted to the mounting holes after removal of the saw guide for drilling holes for receiving the lugs of the condyle prosthesis.
489 Citations
3 Claims
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1. A method of replacing a portion of a knee joint in an animal with an implanted prosthesis comprising:
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a. positioning a first guide relative the distal end of a femur and making a distal femoral cut using said guide; b. positioning a second guide adjacent a proximal end of a tibia and making a proximal tibial cut using said guide; c. attaching a spacer element to said second guide and positioning said spacer between said proximal tibia end and distal femur end to provide a spacing between said distal femur end and proximal tibial end when said femur and tibia are in flexion which correlates to the operative thickness of the implanted prosthesis; d. attaching a guide block having at least two guide bores to said spacer to form a predetermined angle between a guide face of said guide block and the proximal tibial cut; e. positioning said femur with said distal femoral cut adjacent to said guide face and matching said guide face with said spacer in place; f. boring at least two mounting bores in the distal femur using said guide bores in said guide block to position said mounting bores; g. mounting a chamfer cut guide to the distal end of the femur using said mounting bores to position the chamfer cut guide on the femur; h. cutting at least one femur chamfer cut using said chamfer cut guide to position said cut; i. attaching a femoral prostheses component along said at least one femur chamfer cut; and j. attaching a tibial prostheses component along said proximal tibia cut. - View Dependent Claims (2, 3)
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Specification