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 surface and an inferior surface;
a base component having a superior surface and an inferior surface, wherein the base component having a protrusion extending from the superior surface and configured to mate with a recess in the bearing component, the protrusion having a first feature configured to couple with a second feature of the bearing component when the protrusion is inserted into the recess to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction, and wherein the first feature and the second feature are configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction; and
a shim component insertable between the inferior surface of the bearing component and the superior surface of the base component, wherein upon insertion the shim component is configured to engage both the bearing component and the base component to restrain the bearing component from significant relative movement in the proximal/distal direction relative to the base component, and wherein the shim component is configured to be disposed between the inferior surface of the bearing component and the superior surface of 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 beating 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.
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Citations
19 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 surface and an inferior surface; a base component having a superior surface and an inferior surface, wherein the base component having a protrusion extending from the superior surface and configured to mate with a recess in the bearing component, the protrusion having a first feature configured to couple with a second feature of the bearing component when the protrusion is inserted into the recess to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction, and wherein the first feature and the second feature are configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction; and a shim component insertable between the inferior surface of the bearing component and the superior surface of the base component, wherein upon insertion the shim component is configured to engage both the bearing component and the base component to restrain the bearing component from significant relative movement in the proximal/distal direction relative to the base component, and wherein the shim component is configured to be disposed 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)
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9. 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 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; coupling a first shim component with the bearing component and the base component to restrain the base component and the bearing component from relative movement in a proximal/distal direction, wherein the mating features are configured to allow the bearing component to be movable relative to the base component 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 (10, 11)
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12. A tibial shim component for use with a tibial prosthesis system for implantation on a resected surface of a proximal tibia, the tibial shim component comprising:
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a posterior side; an anterior side opposing the posterior side; a superior surface extending between the posterior side and the anterior side; an inferior surface opposing the superior surface; a notch formed on the posterior side of the shim component, wherein the notch is configured to engage with a feature of a base component; and one or more rails extending from the superior surface of the shim component and configured to engage with one or more slots of a bearing component, wherein each of the one or more rails includes a rounded posterior facing edge and one or more of a medial or lateral wall that is a tapered in the proximal/distal direction. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification