An intramedullary bone device comprises a distal outer member (10) having at least one opening (20,24) in a wall thereof, a proximal outer member (30) for positioning in substantial axial alignment with the distal outer member (10), the proximal outer member (30) having at least one opening (44,48) in a wall thereof. The distal outer member (10) and the proximal outer member (30) each have a passage therein. The device also has a distal inner member (50) sized to be slideably received within the passage of the distal outer member (10) and a proximal inner member (70) sized to be slideably received within the passage of the proximal outer member (30). An extender/retractor (94) is selectively operable to selectively alter the relative longitudinal positioning between the distal inner member (50) and the proximal inner member (70). The extender/retractor is able to selectively extend or retract to selectively lengthen or shorten, respectively, the device. The device has pins (102) movable between a retracted position and an extended position, wherein the pins extend through the at least one opening in the distal and proximal outer members to fix the device to a bone during use.La présente invention concerne un dispositif osseux intramédullaire comprenant un élément extérieur distal (10) ayant au moins une ouverture (20, 24) dans une paroi, un élément extérieur proximal (30) pour un positionnement dans un alignement sensiblement axial avec l’élément extérieur distal (10), l’élément extérieur proximal (30) ayant au moins une ouverture (44, 48) dans une paroi. L’élément extérieur distal (10) et l’élément extérieur proximal (30) ont chacun un passage. Le dispositif comprend aussi un élément intérieur distal (50) dont la taille est adaptée pour être reçu de manière coulissante dans le passage de l’élément extérieur distal (10) et un élément intérieur proximal (70) dont la taille est adaptée pour être reçu de manière coulissante dans le passage de l’élément extérieur proxim
