The device for osteosynthesis comprises a bone plate (1) with an underside (2), which Is Intended for resting against the bone, with an upper side (3), at least one passage (4), which joins the underside (2) to the upper side (3) and is provided for accommodating a multiaxlally pivotal insert (10) for a bone screw (20), whereby the passage (4) has a central axis (5). The inventive device also comprises an insert (10), which can be inserted into the passage (4), is provided with a central boring (11) for accommodating a bone screw (20), whereby the boring (11) has a longitudinal axis (12), and the insert has a peripheral outer surface (17) intended for placing in contact with the passage (4). The insert (10) Is designed so that it can be radially compressed and radially expanded, and the cross-section (6) of the passage (4), which is orthogonal to the central axis (5), Is non-circular. The cross-section (16) of the Insert (10) that Is orthogonal to the longitudinal axis (12) has a shape that essentially corresponds to the cross-section (6) of the passage (4) of the bone plate (1), and the insert (10) inserted In the passage (4) is fixed so that it does not rotate in relation to the longitudinal axis (12) thereof but, inside the passage (4), remains pivotal in relation to the bone plate (1).
