Knee prosthesis including rotatable post

Abstract

A knee joint prosthesis for a tibia and femur can include a tibial component, a tibial bearing, and a post. The tibial bearing can include a first bearing portion, a second bearing portion, and an aperture. The first bearing portion can be positionable on a first side of the sagittal axis and can have a first shape. The second bearing portion can be positionable on a second side can have a second shape different than the first shape. The post, together with the first bearing portion and the second bearing portion, can be configured to promote the femur to pivot substantially about the first bearing portion.

1 . A knee joint prosthesis for a human tibia and femur, the knee joint prosthesis comprising:
 a tibial component comprising:   a tibial baseplate comprising a proximal surface including a sagittal axis, and an opposing distal surface; and   a tibial stem extending from the distal surface of the tibial baseplate and including a cavity therein;   a tibial bearing disposable on the proximal surface of the tibial baseplate, the tibial bearing comprising:   a first bearing portion positionable on a first side of the sagittal axis and having a first shape;   a second bearing portion positionable on a second side of the sagittal axis and having a second shape different than the first shape; and   an aperture alignable with the cavity of the tibial stem; and   a post extendable through the aperture of the tibial bearing and disposable in the cavity of the tibial component, the post rotatable relative to the tibial baseplate and the tibial bearing, the post together with the first bearing portion and the second bearing portion configured to promote the femur to substantially pivot about the first bearing portion.