The invention relates to a method for controlling a change of resistance in an artificial joint of an orthosis, an exoskeleton or prosthesis of a lower extremity, wherein the artificial joint has an upper part (1) and a lower part (2) which are secured on each other so as to be pivotable about a pivot axis (4), wherein a damper unit (6) is secured between the upper part (1) and the lower part (2) in order to provide a resistance to flexion or extension of the artificial joint, and the damper unit (6) is assigned an adjusting mechanism (7) via which the resistance is changed when a sensor signal of a control unit (8) assigned to the adjusting mechanism (7) activates the adjusting mechanism (7), wherein the resistance is changed as a function of the position (fB)and/or length (LB) of the measured or calculated leg tendon (LC) and/or the time derivatives thereof.
