The invention relates to an osteosynthesis device comprising on the one hand a plate (12) which can be adjusted along a bone element (10) and at least one pin (26) and on the other hand a locking bushing (30) for rigidly connecting said plate (12) and said at least one pin (26). Said locking bushing (30) has a screwable part (32) and a drive part (34) separated from each other by a breakable zone (38) said screwable part having axial slits (44) that form notches (50). Said breakable zone (38) is intended to be broken in order to free said screwable zone (32) from said drive part (34). Said axial slits (44) extend into said breakable zone (38) so as to be able to fragment said screwable part (32) into independent notches (50) when said breakable zone (38) is broken in order to be able to adjust the relative position of said notches (50) around said at least one pin (26).
