Patent ID: 9668870
Date: 2017-06-06
CPC Classifications: A61F

Claim:
1. A knee joint prosthesis, comprising: a tibial baseplate including a tibial plateau, having a proximal surface and an opposing distal surface, and a tibial stem extending from the distal surface of the tibial plateau; a tibial insert, located on the proximal surface of the tibial plateau, including an aperture; a spine formed of a first material extending through the aperture of the tibial insert and into a cavity of the tibial stem, from the proximal surface of the tibial plateau, the spine rotatable with respect to the tibial baseplate and the tibial insert, wherein the spine includes a proximal spine portion, projecting proximally from a proximal articular surface of the tibial insert, wherein the spine includes an intermediate spine portion, the intermediate spine portion disposed within the aperture of the tibial insert, the intermediate spine portion extending from the proximal surface of the tibial baseplate to the proximal articular surface of the tibial insert, the intermediate spine portion having a cylindrical shape, configured to rotatably articulate with a wall of the aperture, wherein the spine includes a distal spine portion, disposed within the cavity of the tibial stem, having a tapered, substantially conical shape; and a sleeve formed of a second material coupled about an outer spine surface,wherein the first material is different from the second material.