An osteo-implant including two end portions, at least one middle structure and a plurality of connection portions is provided. The middle structure is disposed between the two end portions and includes a plurality of middle portions. The middle portions are connected to the two end portions through the connection portions. When the two end portions are moved relatively along an axial direction of the osteo-implant, the two end portions drive the middle portions to push with each other and have displacements along a radial direction of the osteo-implant through the connection portions, such that an outer diameter of the osteo-implant is increased by the middle portions.一種骨植入物，包括兩端部、至少一中間結構及多個連接部。中間結構配置於兩端部之間且包括多個中間部。這些中間部藉由這些連接部而連接於兩端部。當兩端部沿骨植入物的軸向相對移動時，兩端部藉由這些連接部帶動這些中間部相互推抵而在該骨植入物的徑向上產生位移，以藉由這些中間部增加骨植入物的外徑。
