Method of arthroplastly on a knee joint and apparatus for use in same
First Claim
1. A method of arthroplasty on a joint comprising first and second bones, said method comprising the steps of:
- (a) obtaining a desired spacing of said first and second bones;
(b) determining depth of bone to be resected from at least one of said first and second bones to enable fitting of at least one prosthesis selected from a plurality of prostheses;
(c) resecting bone from one or both of said first and second bones substantially to the determined depth in the or each one, respectively; and
(d) fitting the or each said prosthesis.
1 Assignment
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Accused Products
Abstract
A method of, and apparatus for, arthroplasty of a knee joint comprising obtaining a desired spacing of the femur from the tibia by inserting a spacer into the knee joint between the femur and the tibia. The spacer is used as a reference for securing a guide jig in position about the knee joint for guiding resection of one or both of the femur and tibia for fitting of tibial and/or femoral prostheses. A method of resecting the femur while moving the tibia through an arc of motion to remove bone to the desired depth, a method of determining the position of the guide jig, the guide jog, an alignment device and the spacer are also described.
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Citations
83 Claims
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1. A method of arthroplasty on a joint comprising first and second bones, said method comprising the steps of:
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(a) obtaining a desired spacing of said first and second bones;
(b) determining depth of bone to be resected from at least one of said first and second bones to enable fitting of at least one prosthesis selected from a plurality of prostheses;
(c) resecting bone from one or both of said first and second bones substantially to the determined depth in the or each one, respectively; and
(d) fitting the or each said prosthesis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of arthroplasty on a knee joint, comprising the steps of:
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(a) surgically providing access to the knee joint;
(b) selecting at least one spacer for providing a desired spacing of the femur from the tibia;
(c) positioning the selected spacer in the knee joint to obtain the desired spacing of the femur from the tibia;
(d) using the spacer as a reference to determine a location on each one of the tibia and the femur indicating depth of bone to be resected from each for fitting of chosen tibial and femoral prostheses;
(e) cutting the tibia and the femur substantially at the determined location on each for resection of the bone from each one to the required said depth from each one, respectively; and
(f) fitting the chosen tibial and femoral prostheses. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of arthroplasty on a knee joint, comprising the steps of:
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(a) locating a cutting device in position in a knee joint between the femur and the tibia; and
(b) moving the tibia through a range of motion about the femur between at least partially flexed and extended positions while the cutting device is being operated to thereby remove bone substantially to a desired depth from the femur in a direction of travel of the tibia relative to the femur, for enabling fitting of a femoral prosthesis to the femur. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A method of determining the position of a guide jig about a knee joint for subsequently guiding cutting of one or both of the tibia and the femur at a desired depth in either one respectively, the method comprising:
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(a) locating a selected spacer in the knee joint to obtain a desired spacing of the femur from the tibia; and
(b) arranging the guide jig and the spacer together to thereby determine the position of the guide jig about the knee joint for guiding the cutting of either one of the tibia and the femur. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44)
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- 45. A guide jig for use in a method of arthroplasty on a knee joint of a patient, wherein the guide jig is adapted for guiding cutting of at least one of the tibia and the femur in resection of bone therefrom for enabling fitting of one or both of a tibia and a femoral prosthesis, and wherein the guide jig is further adapted for being arranged with a selected spacer for spacing the femur from the tibia and for being secured about the knee joint in a position determined by the spacer to guide cutting of at least one of the tibia and the femur, respectively, substantially at a desired depth.
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59. An alignment device for aligning a guide jig in position about a knee joint for guiding cutting of at least one of the tibia and the femur at a desired location on the or each one respectively during arthroplasty on the knee joint, and comprising:
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a body for receiving the guide jig and coupling the guide jig with an alignment guide for aligning the guide jig in a desired medial to lateral orientation with respect to the knee joint;
and wherein the body is adapted for aligning the guide jig at a desired angle in an anterior to posterior direction of the knee joint and for securing of the guide jig at the desired angle prior to removal of the body from about the knee joint for allowing cutting of the one or both of the tibia and the femur to be guided by the guide jig. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66)
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67. An alignment device for supporting a cutting device for resecting bone from the tibia to a desired depth to form a recess in the tibia during arthroplasty on a knee joint, and comprising:
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a body for receiving a guide jig for guiding cutting of the tibia and coupling the guide jig with an alignment guide for aligning the guide jig in a desired medial to lateral orientation with respect to the knee joint;
and wherein the body is adapted for aligning the guide jig at a desired angle relative to the knee joint in an anterior to posterior direction and for being secured about the knee joint in a position determined by the guide jig for supporting the cutting device following removal of the guide jig from the body. - View Dependent Claims (68, 69, 70, 71, 72)
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- 73. A spacer for being inserted into a knee joint to provide a desired spacing of the femur from the tibia in arthroplasty on the knee joint, comprising an elongate member with a leading end region adapted for being inserted between the tibia and the femur to thereby obtain the desired spacing of the femur from the tibia, and an opposite end region adapted for coupling with a guide jig for guiding the cutting of the or each one of the tibia and the femur in the resection of the bone.
- 80. A set of spacers for allowing selection of at least one of the spacers for insertion into a knee joint to provide a desired spacing of the femur from the tibia in arthroplasty on the knee joint, each said spacer respectively comprising a leading end region adapted for being inserted between the tibia and the femur to thereby space the femur from the tibia, and an opposite end region adapted for protruding from the knee joint and coupling with a guide jig for guiding cutting of the or each one of the tibia and the femur in the resection of the bone, wherein the spacers have a different thickness to one another for providing different spacings of the femur from the tibia.
Specification