A bone fixation system includes a fixation plate formed of a fiber reinforced polymer composite material with a plurality of apertures configured to receive screws for fracture fixation. An malleable metallic insert is disposed within each aperture. The inserts may be sized to accept locking or non-locking screws over a range of angles. The inserts may protrude through the plate on the bone side, providing clearance between the composite plate and the bone. The apertures and inserts may have a generally cylindrical or obround shape. In embodiments, the inserts are shaped complementary to the apertures in which they are disposed.