The osteosynthetic device for the fixation of a bone or bone fragments has a longitudinal axis (6) and comprises a bone screw (1) with a shaft (2) bearing a thread (3), a front end (4) and a rear end (5), said thread (3) having a maximum outer diameter d; and a wing-like blade (7) with a leading end (8) being connected to the front end (4) of the bone screw (1) and a trailing end (9) being connected to the rear end (5) of the bone screw (1). The blade (7) is further provided with a coaxial longitudinal aperture (17) having a length I extending between the leading end (8) and the trailing end (9) and a width w≧d. Further the blade (7) is coaxially and rotatably mounted on said shaft (3) of said bone screw (1).