Patent ID: 6443991
Filing Date: 2002-09-03
Classification: A61F

Abstract:
A knee prosthesis comprising:a femoral component to be attached to the distal end of a femur and having condyle surfaces spaced apart to define a notch therebetween and having an anterior femoral cam and a posterior femoral cam disposed in the notch, a tibial component to be attached to the proximal end of a tibia and comprising a platform for attachment to the tibia and a bearing having an anterior portion and a posterior portion, the bearing rotatably mounted on the platform for rotational movement about an axis extending generally in the direction of the tibia, wherein (i) the bearing has (a) bearing surfaces for supporting the condyle surfaces and (b) a spine for extending upwardly into the notch, (ii) the spine has (a) an anterior tibial cam for engaging the anterior femoral cam, (b) a posterior tibial cam for engaging the posterior femoral cam, and (c) a peak between the anterior and posterior tibial cams, (iii) the anterior tibial cam inclines upwardly from the anterior portion of the bearing, (iv) the posterior tibial cam extends downwardly from the peak, (v) the posterior tibial cam, when viewed in a side elevational view, defines a vertically extending line, and (vi) the vertically extending line is arranged coincident with the axis.