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。
