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, the base component having a first feature extending from the superior surface and configured to mate with a corresponding second feature on the inferior surface of the bearing component, the first feature and the second feature configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction and the first feature and the second feature configured to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction; and
a shim component configured to be received between the inferior surface of the bearing component and the superior surface of the base component, the shim component configured to set a relative proximal/distal position between the inferior surface of the bearing component and the superior surface of the base component.
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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 joint to be distracted by a distance equal to the height of a particular shim.
157 Citations
21 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, the base component having a first feature extending from the superior surface and configured to mate with a corresponding second feature on the inferior surface of the bearing component, the first feature and the second feature configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction and the first feature and the second feature configured to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction; and a shim component configured to be received between the inferior surface of the bearing component and the superior surface of the base component, the shim component configured to set a relative proximal/distal position between the inferior surface of the bearing component and the superior surface of the base component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of performing a surgical procedure on a portion of a knee joint, the method comprising:
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implanting a base component on a resected tibia; coupling a first shim component and a bearing component to the base component, the bearing component and base component having mating features configured to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction, the first shim component configured to restrain the base component and the bearing component from relative movement in a proximal/distal direction; and performing range of motion testing to verify proper sizing of a combination of the bearing component, the base component, and the first shim component. - View Dependent Claims (13, 14, 15, 16, 17)
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18. 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 plurality of shim components including shim components having different proximal/distal heights relative to each other, each shim component is configured to be received between the inferior surface of the bearing component and the superior surface of the base component and couple the tibial prosthesis system together as an assembly, wherein when the tibia prosthesis system is coupled together as the assembly each shim component and the bearing component are restrained from substantial movement in two or more of a medial/lateral direction, an anterior/posterior direction and a proximal/distal direction. - View Dependent Claims (19, 20, 21)
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Specification