Provisional tibial prosthesis system
First Claim
1. A tibial prosthesis system for implantation on a resected surface of a proximal tibia, the tibial prosthesis system comprising:
- a bearing component having a superior articulating surface and an inferior surface;
a base component having a superior surface and an inferior surface; and
a shim component configured to be removably received between the inferior surface of the bearing component and the superior surface of the base component by inserting the shim component in a first direction, wherein the shim component is restrained from movement in a second direction substantially perpendicular to the first direction once the shim component engages with at least one of the bearing component and the base component.
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Accused Products
Abstract
The present disclosure provides a provisional tibial prosthesis system for a set of prosthetic knee joints for implantation in a natural knee, the provisional tibial prosthesis system including a bearing component and a bearing support, the spacing of the bearing component from the bearing support is adjustable to allow for representation of a variety of different sized final tibial prostheses. In this system, only one provisional bearing component corresponding to each level of constraint is needed and shims are used to adjust the spacing of the bearing component from the bearing support. The shims are slidably insertable between the bearing component and the bearing support in an anterior/posterior direction to allow for adjustment of the spacing of the bearing component from the bearing support. The number of provisional components needed during knee surgery is reduced and adjustment of the system only requires the knee join to be distracted by a distance equal to the height of a particular shim.
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Citations
23 Claims
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1. A tibial prosthesis system for implantation on a resected surface of a proximal tibia, the tibial prosthesis system comprising:
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a bearing component having a superior articulating surface and an inferior surface; a base component having a superior surface and an inferior surface; and a shim component configured to be removably received between the inferior surface of the bearing component and the superior surface of the base component by inserting the shim component in a first direction, wherein the shim component is restrained from movement in a second direction substantially perpendicular to the first direction once the shim component engages with at least one of the bearing component and the base component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A tibial prosthesis system, comprising:
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a bearing component having a superior articulating surface and an inferior surface; a base component having a superior surface and an inferior surface; and a plurality of shim components including shim components having different heights relative to each other, each shim component configured to be removably received between the inferior surface of the bearing component and the superior surface of the base component by inserting the shim component in a first direction, wherein each of the shim components is restrained from movement in a second direction substantially perpendicular to the first direction once the shim component engages with at least one of the bearing component and the base component. - View Dependent Claims (15, 16, 17)
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18. A method of performing a surgical procedure on a portion of a knee joint, the method comprising:
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implanting a tibial prosthesis on a resected tibia, the tibial prosthesis including a bearing component and a base component; inserting a first shim component in a first direction between the bearing component and the base component, the first shim component being restrained from movement in a second direction substantially perpendicular to the first direction once the first shim component engages with at least one of the bearing component and the base component, whereby the bearing component and the base component are spaced apart by a proximal/distal distance equal to a first shim height of the first shim component; performing range of motion testing to verify proper sizing of the tibial prosthesis; and when the testing indicates that the tibial prosthesis is not properly sized, inserting a second shim component in the first direction between the bearing component and the base component, the second shim component being restrained from movement in the second direction. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification