Patent ID: 7033397
Filing Date: 2006-04-25
Classification: A61F

Abstract:
1. A mobile bearing unicondylar tibial knee prosthesis comprising: a tibial base plate having a superior surface for sliding engagement with an articular surface component and an inferior surface for engaging the tibia, the base plate including an inside edge positionable adjacent to the midline of the proximal tibia adjacent to the intercondylar eminence, an outside edge positionable adjacent to the outer side of the proximal tibia, an anterior aspect positionable adjacent to the anterior side of the proximal tibia, and a posterior aspect positionable adjacent to the posterior side of the proximal tibia, the base plate including an inside rail projecting superiorly from the superior surface of the plate adjacent to the inside edge, the base plate including an anterior stop projecting superiorly from the superior surface of the plate adjacent to the anterior aspect, a portion of the anterior stop extending from the rail, around the anterior aspect of the plate, and back toward the posterior aspect of the plate part-way along the outside edge such that the rail and anterior stop form a generally “J”-shaped constraint wall; and a tibial articular surface component, the articular surface component comprising a superior surface for articulation with a femoral knee component, an inferior surface for sliding engagement with the superior surface of the base plate, an inside edge, an outside edge, an anterior aspect, and a posterior aspect, the articular surface component positionable on the superior surface of the base plate for sliding from the anterior aspect to the posterior aspect of the base plate, from the inside edge to the outside edge of the base plate, and for rotation on the base plate, the inside rail limiting the motion of the articular surface component toward the inside edge of the base plate and the anterior stop limiting motion of the articular surface component toward the anterior aspect of the base plate.