Surgical apparatus for use in total knee arthroplasty and surgical methods for using said apparatus
First Claim
1. A surgical apparatus for tensioning soft tissues between the femur and the tibia during knee arthroplasty, comprising:
- (a) first engaging means for engaging a tibial plateau;
(b) second engaging means for engaging medial and lateral femoral condyles, said second engaging means having a medial side, a central region and a lateral side;
(c) translation means coupled to said first and second engaging means for translationally moving said first and second engagement means relative to each other; and
(d) medial rotational coupling means for coupling said second engaging means to said translation means such that said second engaging means is free to rotate relative to said translation means about a point which is laterally offset from said central region toward said medial side, so that rotation is substantially aligned with the medial femoral condyle.
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Accused Products
Abstract
An apparatus for use in total knee arthroplasty includes a tibia engaging plate which is coupled to an upstanding rack member, a drill bushing bracket coupled to the rack member by a lockable pinion member, and a femoral positioning jig which is rotatably coupled to the drill bushing bracket. The drill bushing bracket has a pair of spaced apart drill bushings which are dimensionally located to correspond in position to medial and lateral condyles of the femur. The centers of the drill bushings lie in a plane which is parallel to the plane in which the tibia engaging plate lies. The femoral positioning jig is provided with a pair of posterior skids, one for the lateral posterior condyle and one for the medial posterior condyle, a pair of holes for attaching the jig to the resected distal femur with spikes, and a pair of holes for receiving the two drill bushings. Two different femoral positioning jigs are provided, one for the right knee and one for the left knee. In both jigs, the hole for receiving the medial drill bushing is circular and the hole for receiving the lateral drill bushing is oblong or kidney shaped. This allows the positioning jig (and the femur) to rotate about the axis of the medial drill bushing. The positioning jigs are also each provided with angular indicia adjacent the lateral oblong hole and the drill bushing bracket is provided with left and right indicia indicating the axial center of each drill bushing.
417 Citations
22 Claims
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1. A surgical apparatus for tensioning soft tissues between the femur and the tibia during knee arthroplasty, comprising:
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(a) first engaging means for engaging a tibial plateau; (b) second engaging means for engaging medial and lateral femoral condyles, said second engaging means having a medial side, a central region and a lateral side; (c) translation means coupled to said first and second engaging means for translationally moving said first and second engagement means relative to each other; and (d) medial rotational coupling means for coupling said second engaging means to said translation means such that said second engaging means is free to rotate relative to said translation means about a point which is laterally offset from said central region toward said medial side, so that rotation is substantially aligned with the medial femoral condyle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A surgical apparatus for tensioning soft tissues between the femur and the tibia during knee arthroplasty, comprising:
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(a) tibial engagement means for engaging a resected tibial plateau; (b) a drill bushing bracket having a lateral drill bushing and a medial drill bushing, each drill bushing having an axis, said axes of said pair of drill bushings defining a first plane; (c) translation means coupled to said tibial engagement means and said drill bushing bracket for translationally moving said drill bushing bracket relative to said tibial engagement means; and (d) a femoral positioning jig rotationally coupled to said medial drill bushing, said femoral positioning jig having a posterior medial condyle engaging skid, a posterior lateral condyle engaging skid, and means for securing the position of said jig relative to the femur, wherein said first plane remains substantially parallel to the resected tibial plateau when said tibial engagement means engages the plateau, and said positioning jig and the femur are free to rotate about said medial drill bushing when said positioning jig is secured to the femur. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for tensioning a knee in flexion during knee arthroplasty, comprising the steps of:
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(a) resecting a portion of the proximal tibia and a portion of the distal femur; (b) moving the knee to the flexion position; (c) attaching a femoral positioning jig to the distal end of the femur, the femoral positioning jig having a medial rotation coupling; (d) placing a first end of a tensioning device on the tibial plateau and rotationally coupling a second end of the tensioning device to the medial rotation coupling of the femoral positioning jig, the second end of the tensioning device having locating structure for locating a line on the femur which is parallel to the tibial plateau; and (e) adjusting the tensioning device to move the femur and tibia apart from each other such that collateral ligaments are tensioned. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification