A device for external fixation of a first bone element (O1) and a second bone element (O2) articulated with each other, comprising: - a guide element (2) equipped with a curvilinear guide (3)； - a first fastening element (7) slidably associated with the guide (3) and equipped with first means (9) for releasable fastening to the first bone element (O1)； - a second fastening element (10) slidably associated with the guide (3) and equipped with second means (11) for releasable fastening to the second bone element (O2)； - and relative displacement means (14) by means of which the first clamping element (7) moves with respect to the second clamping element (10) along the guide (3), configured to operate simultaneously in both the first clamping element as in the second clamping element (10) in such a way as to move them along the guide (3), the device being characterized in that the relative displacement means (14) comprise at least one partially threaded element (15) screwed by its two ends respectively to the first and second fastener (7, 10) to define a nut and feed screw coupling with each of said fasteners, the threaded element (15) being designed for be driven in rotation so that it moves both the first and the second fastener (7, 10) along the guide (3), and by which the threaded element (15) comprises: - a first part (21 ) what it has a left-hand thread that engages in a screwed manner with one or the other of the first and the second fastener (7, 10)； - a second part (22) having a right hand thread that engages in a screwed manner with the other of the first and second fastener (7, 10).Un dispositivo para la fijación externa de un primer elemento óseo (O1) y un segundo elemento óseo (O2) articulados entre sí, que comprende: - un elemento de guía (2) equipado con una guía curvilínea (3)； - un primer elemento de sujeción (7) asociado de manera deslizante con la guía (3) y equipado con primeros medios (9) para la sujeción liberable al primer elemento óseo (O1)； - u
