<p>A bone fixation system has a bone implant with an implant body. The implant body defines an upper surface, a bone-facing surface spaced from the upper surface along a transverse direction, and at least one aperture defined by an inner wall. A bone fixation element is configured for insertion at least partially through the aperture. The bone fixation element has a head and a shaft that extends relative to the head in a distal direction. The head defines a ridge and at least one thread that is spaced from the ridge in the distal direction. The ridge is configured to compress a bone implant against the at least one thread so as to fixedly retain the bone implant with respect to the head.</p>
