The invention relates to a prosthetic or orthetic device (1, 1&prime；) of the prosthesis or orthesis articulation module type, particularly for an ankle or ankle foot, comprising: &mdash；at least one upper fastening (7&prime；, 7&prime；&Prime；) and a lower fastening (7, 7&Prime；) connected to one another by at least two link rods (8； 8a, 8b), notably one (8a) at the front and one (8b) at the rear, &mdash；at least one articulation connecting the upper fastening (7&prime；, 7&prime；&Prime；) and the lower fastening (7, 7&Prime；), &mdash；at least one drive means (3, 3a, 3b, 5, 5&prime；) connected to a link rod (8； 8a, 8b), secured to the upper fastening (7&prime；, 7&Prime；) of the device (1, 1&prime；) and able to move this link rod (8； 8a, 8b) so as to set the lower (7, 7&Prime；) and upper (7&prime；, 7&prime；&Prime；) fastenings in motion relative to their articulation, in which device the drive means is at least one eccentric (2； 2a, 2b) made to move by means of a cogged wheel (3； 3a, 3b) secured to the eccentric (2； 2a, 2b) and in mesh with an actuator.
