A bone screw is provided including a tubular body (1) having a first end (2) and a second end (3), wherein the tubular body has a tubular wall defining a cavity and wherein a plurality of openings are provided extending through the tubular wall into the cavity； an exterior bone thread on an exterior tubular surface of the tubular wall； a head (8) configured to engage with a driver to advance the bone screw in the bone by rotating the driver in a first direction, the head being also configured to connect to the tubular body at the first end (2)； wherein the head is connectable to the tubular body in such a way that it is locked against disconnection from the tubular body when the driver is rotated in a second direction opposite to the first direction.本案提供一種骨骼螺釘，包含：管狀本體(1)，有第一端(2)和第二端(3)，其中管狀本體有管狀壁，界定腔室，又其中設有複數開口，延伸貫穿管狀壁，進入腔室內；陽骨骼螺紋，在管狀壁的外管狀表面；頭部(8)，構成可與螺絲起子結合，按第一方向轉動螺絲起子，即可把骨骼螺釘推進到骨骼內，頭部又構成連接管狀本體的第一端(2)；其中頭部可以此方式連接於管狀本體，即螺絲起子以第一方向相反的第二方向轉動時，即被鎖定，以防從管狀本體脫落。
