Knee prosthesis including rotatable spine

摘要

A knee joint prosthesis is disclosed. The knee joint prosthesis can include a tibial baseplate, a tibial insert, and a spine. The tibial baseplate can include 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. The tibial insert can be located on the proximal surface of the tibial plateau and can include an aperture. The spine can extend 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 can be rotatable with respect to the tibial baseplate and the tibial insert. The knee joint prosthesis can further include a femoral component including a posteriorly-located femoral cam. The posteriorly-located femoral cam can engage the spine during movement of the knee joint prosthesis.

主权项

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; and a spine 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 tapered, substantially conical 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.