High flexion tibial tray
AssigneeBiomet Manufacturing, LLC
InventorRobert Metzger
Life of this patent
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Abstract
Various assemblies for replacing at least a proximal portion of a tibia are provided. One assembly includes a tibial tray including a superior bearing engaging surface and an inferior bone engaging surface and having a truncated posterior region; a bearing including an articulating surface, a tray mating surface, and an overhang. The tray mating surface of the bearing is in mating engagement with the inferior bone engaging surface of the tibial tray such that the overhang of the bearing extend beyond the tibial tray truncated posterior region. Related surgical methods are also provided.
Claims7
An assembly having an assembly length as measured along a sagittal plane for replacing at least a proximal portion of a tibia comprising:
- a. a tibial tray having a superior surface and an inferior surface and having a thickness T1;
- and
- b. a bearing having a superior surface, an inferior surface, and a rounded corner at a posterior end of the bearing having a constant radius as measured from a sagittal plane, wherein the bearing has a thickness of T2,
- wherein the ratio of T2 to T1 continuously increases from about a midline of the assembly length to a posterior end of the tibial tray.
An assembly having an assembly length as measured along a sagittal plane for replacing at least a proximal portion of a tibia comprising:
- a. a tibial tray having a superior surface and an inferior surface, a first thickness at an anterior end and a second thickness at a posterior end;
- and
- b. a bearing having a superior surface, an inferior surface, a rounded corner at a posterior end of the bearing having a constant radius transitioning from the superior surface to a perimeter sidewall at the posterior end between the superior surface and the inferior surface as measured from a sagittal plane, and an overhang having a third thickness;
- wherein the thickness of the tibial tray decreases from the first thickness to the second thickness in a stepped manner between a midline of the assembly length and the posterior end of the tibial tray;
- wherein the inferior surface of the bearing is in mating engagement with the superior surface of the tibial tray such that the overhang engages an area of the tibial tray having the second thickness.
Dependencies are inferred from the claim text.