Abstract: Knee orthosis having a femoral orthosis member and a tibial orthosis member, which are joined to one another by way of lateral joints, the bending of the joints being defined in each case by two guideways, especially guide slots, on the one hand and by associated cams, especially pin followers, on the other hand, the guideways, especially guide slots, extending along two fixed centrodes, especially fixed centrode circles, that intersect at a point.