Abstract: A fixating device for fixating a femur fracture in the proximity of the hip joint, comprises an arcuate anchoring arm (17) which is intended to be inserted through an aperture formed in the wall of the femur and down in the femur and brought to an anchoring position therein. The arm merges at one end thereof with a guide part (15) provided with at least one guide hole (24, 25), with a fixating screw to be screwed into the neck of the femur. The anchoring arm (17) terminates in a free end (17A). The guide part (15) has an inwardly facing surface (15B) and an outwardly facing surface (15A), which touch respectively an inner plane (30), and outer plane (29). A center plane 31 lies approximately midway between and is parallel to the inner and outer planes and to the main longitudinal direction of the guide part. The anchoring arm has a convex outer surface tangential to a further plane (32) which is parallel to the other planes.