Patent ID: 6013103
Filing Date: 2000-01-11
Classification: A61F

Abstract:
A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia; the knee prosthesis comprising:(a) a tibial component for mounting to the proximal end of the tibia, said tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and(b) a femoral component for mounting to the distal end of the femur, said femoral component including a medial condylar portion having a face surface for pivotally coacting with said semispherical medial cavity of said tibial component and including a lateral condylar portion having a face surface for movably coacting with said lateral cavity of said tibial component; said face surface of said medial condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape only from a posterior point on said posterior side of said face surface of said medial condylar portion to an anterior point on said anterior side of said face surface of said medial condylar portion located about 130.degree. from said posterior point; said face surface of said lateral condylar portion having a posterior side, a distal side, an anterior side, and a semispherical shape; said semispherical shape of said face surface of said medial condylar portion being substantially congruent with said semispherical medial cavity of said tibial component so that substantially complete surface-to-surface contact between said semispherical medial cavity of said tibial component and said face surface of said medial condylar portion of said femoral component is provided only throughout the range of flexion of about 130.degree. of the knee joint.