Patent ID: 8470047
Filing Date: 2013-06-25
Classification: A61F

Abstract:
1. A fixed-bearing knee prosthesis, comprising: a femoral component having a medial condyle surface and a lateral condyle surface, a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and a tibial tray secured to the bearing, the tibial tray having a platform with an elongated stem extending downwardly from a lower surface thereof, the platform having (i) a peripheral rail extending along at least an anterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, and (ii) a retaining rail extending upwardly from the upper surface of the platform and posteriorly away from the peripheral rail, wherein (i) the retaining rail has a posterior width defined by the distance between a lateral end and a medial end of a posterior-most edge of the retaining rail, (ii) the retaining rail has a length defined by the distance of an imaginary center line segment extending from the anterior edge of the tibial tray to a midpoint located along the posterior-most edge halfway between the lateral end and the medial end, and (iii) the posterior width of the retaining rail is less than, or equal to, the length of the retaining rail.