The invention relates to a fixation arrangement comprising a holder (2 ) and a clamping sleeve (4 ) receiving a bone screw (1 ) wherein the bone screw (1 ) has a shank (10 ) with a front thread (11 ) and a head (12 ) at the rear end wherein the holder (3 ) is provided with a through bore (30 ) and a receiving seat (32 ) in which the clamping sleeve (4 ) is mounted so as to be pivotable wherein the shank (10 ) in a rear area in front of the head (12 ) has a thickened part (15 ) of which the width increases towards the head (12 ) and the width of the clamping sleeve (4 ) is greater than the width of the shank (10 ) directly in front of the thickened part (15 ) and smaller than the maximum width of the thickened part (15 ). During the screwing in procedure the thickened part (15) widens the clamping sleeve (4 ) such that the latter is pressed with its jacket against the wall of the receiving seat (32 ). In this way pressing at a stable angle is achieved in any desired orientation of the bone screw (1 ).
