A device for fixation of bone fragments (4, 8) comprises a locking plate (1 ) for fixation on the outside of an outer bone fragment (4). The locking plate has a distal portion (1 a) with at least one first hole (6), extending through the locking plate, for a distal fixing means (2) and a proximal portion (1 b) with a second hole (7), extending through the locking plate, for a proximal fixing means (3). The locking plate (1 ) is configured also with a third hole (9) which is located between said at least one first hole (6) in the distal portion (1 a) of the locking plate and said second hole (7) in the proximal portion (1 b) of the locking plate and this third hole extends as the other holes through the locking plate. The device further comprises a rotary-preventing and load-carrying means (10) which is configured for inser¬ tion and fixation in said third hole (9) in the locking plate (1 ) and by cooperating with the proximal fixing means (3) prevent rotation of the proximal fixing means but permit displa¬ cement thereof in its longitudinal direction relative to the rotary-preventing and load-car¬ rying means during compression after surgery of the outer and inner bone fragments (4, 8) and facilitate for the proximal fixing means to carry loading forces acting on the inner bone fragment (8).Un dispositif de fixation de fragments osseux (4, 8) comprend une plaque de verrouillage (1) pour la fixation sur lextérieur dun fragment osseux externe (4). La plaque de verrouillage présente une partie distale (1 a) avec au moins un premier trou (6), sétendant à travers la plaque de verrouillage, pour recevoir un moyen de fixation distale (2), et une partie proximale (1 b) avec un deuxième trou (7), sétendant à travers la plaque de verrouillage, pour recevoir un moyen de fixation proximale (3). La plaque de verrouillage (1) est conçue également avec un troisième trou (9) qui est situé entre ledit premier trou minimum (6) dans la partie distale (1a) de la plaque de verrouillage
