The invention relates to a replacement knee prosthesis having a femoral component (1) provided with lock pins for attachment to femoral condyls and a plastic tibial component (2) placed in a metal tray (3) fixed to the tibia by means of a pin or a screw. The replacement knee prosthesis is characterized in that the lateral surface of its femoral component (1) has a movement determined by their conical surfaces which is formed in accordance with its logarithmic spiral generatrix (4) while its medial surface corresponds to the conical spiral generatrix (5).
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