Tibial prosthesis systems, kits, and methods

摘要

Tibial prosthesis systems for implantation or use in a knee joint are disclosed. A tibial prosthesis system can include a bearing component, a base component, a shim component, and optionally a spacer component. The shim or spacer component can be inserted between an inferior surface of the bearing component and a superior surface of the base component. The insertion of the shim or spacer component can provide spacing adjustment between the bearing and base components. The shim component can include one or both of a medial edge having a different height than a lateral edge or an anterior edge having a different height than a posterior edge. The differing edge height of the shim component can provide a surgeon with knee joint kinematic insight regarding an angled bone cut before the cut is made, and can allow for sizing of an appropriately permanent prosthesis system using a reduced number of provisional components.

主权项

1. A tibial prosthesis system, comprising:
a bearing component having a superior articulating surface and an inferior surface, the inferior surface having a base component engagement feature; a base component having a superior surface and an inferior surface, the superior surface having a bearing component engagement feature configured to mate with the base component engagement feature such that the bearing component and the base component are removably engageable with each other,
whereby mating of the base component engagement feature and the bearing component engagement feature restrains at least one of anterior/posterior movement or medial/lateral movement between the bearing component and the base component; and a shim component configured to be slidable between the inferior surface of the bearing component and the superior surface of the base component, when the bearing component and the base component are engaged with each other, to removably engage the shim component with at least one of the bearing component and the base component, the shim component including one or both of a medial edge having a different height than a lateral edge or an anterior edge having a different height than a posterior edge, wherein the shim component is sized and shaped to allow passage of the base component engagement feature or the bearing component engagement feature such that the base component engagement feature and the bearing component engagement feature remain mated together when the bearing component and the base component are engaged with each other and the shim component is slid therebetweeen.