Bone screw that includes a tubular body (1, 1 ', 1' '') having a first end (2) and a second end (3), the tubular body presenting a tubular wall defining a cavity that is suitable for housing bone material and multiple openings (5.5 ') being provided that extend through the tubular wall and enter the cavity； an outer bone thread (4) on an outer tubular surface of the tubular wall； a head (8, 80) having an outer diameter greater than the outer diameter of the tubular body, configured to engage a screwdriver in order to advance the bone screw into the bone by rotating the screwdriver in a first direction, also being configured the head to connect it with the tubular body at the first end (2)； the head and the tubular body consisting of independent parts and the head being able to be connected with the tubular body such that it is locked against disconnection of the tubular body when the screwdriver is turned in a second direction, opposite to the first direction, characterized in that the head ( 8, 80) is connected to the tubular body (1) by means of a connection in positive connection, and because a fixing element (15, 50) is provided to block the head.Tornillo para hueso que incluye un cuerpo tubular (1, 1', 1''') que tiene un primer extremo (2) y un segundo extremo (3), presentando el cuerpo tubular una pared tubular que define una cavidad que es adecuada para alojar material de hueso y estando previstas múltiples aberturas (5,5') que se extienden a través de la pared tubular y entran en la cavidad； una rosca exterior para hueso (4) sobre una superficie tubular exterior de la pared tubular； una cabeza (8, 80) que tiene un diámetro exterior mayor que el diámetro exterior del cuerpo tubular, configurada para acoplar un destornillador con el fin de avanzar el tornillo para hueso dentro del hueso mediante el giro del destornillador en un primer sentido, estando igualmente configurada la cabeza para conectarla con el cuerpo tubular en el primer extremo (2)； consistiendo
