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.一種骨固定系統具有一骨植入物，該骨植入物含有一植入物主體。該植入物主體界定一上部表面；一面向骨表面，其沿一橫向方向而與該上部表面相間隔；及至少一孔隙，其藉由一內壁界定。一骨固定元件經組構於至少部分插入穿過該孔隙。該骨固定元件具有一頭部及一軸件，該軸件相對於該頭部在一遠端方向延伸。該頭部界定一脊部及至少一螺紋，該至少一螺紋與該脊部在該遠端方向相間隔。該脊部經組構以壓緊一骨植入物抵靠該至少一螺紋以相對於該頭部固定地保持該骨植入物。
