Exoprosthesis for the human knee-joint

Exoprosthesis for a human knee-joint, comprising an upper leg part which can be connected to a human upper leg and a lower leg part which can be connected to a human lower leg, wherein both leg parts are connected via at least one joint which constructs a joint with two joint momentary axes which are connected so as to carry out a constrained movement, wherein both leg parts, with regard to their momentary joint axes, each respectively has a corresponding curve path on which lies instantaneous centers of motion resulting from a continuous motion and, on both the upper leg part and the lower leg part, curving toothed gearing sections are located which act on each other in an articulated manner in a movement functional area of the joint, wherein a path of the gearing curvatures coincides with the curve paths of both leg parts in the movement functional area, and wherein, when in a straight position, a gearing curvature of the lower leg part runs as interior gearing with an outward curve towards the posterior, and a gearing curvature of the upper leg part runs as exterior gearing with a convex curvature.