Knee prosthesis comprising a femoral component (1), a part of the tibia (2) and an insert (3) is interposed between the part of the femoral and tibial part, in which, in the state of the joint corresponding to the extension of the leg of the patient prosthesis, the complex surface (12) of the insert is totally congruent with the portion of the surface of the femoral part which bears, with the exception of the bottom of the groove intercondyloid (4) which is remote from the top of one side (13) of the insert is a functional clearance (j) and in which each part of this complex surface (12) of the insert (2), situated on one side of the side (13) has a profile of the central unit formed by the succession of two arcs of circle (20, 21) tangent, of different radii, centered on a straight line (l) which is perpendicular to the joint space of the prosthesis, the ring (21) of smaller radius being located at the rear part of the insert (3) and its center (21a) corresponding substantially to the trace in the sagittal plane of the line connecting the epicondyles of the natural articulation to the prosthesis.
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