A compression bone screw (100) comprises a shank (110), a first element (120) and a second element (130). The shank (1 10) has longitudinally opposing first and second shank portions (111, 112). The first shank portion (111) is externally threaded with a first shank thread (113). The first element (120) is threadingly mounted on the first shank portion (111) by way of a first element internal thread (122) threadingly engaging the first shank thread (113). The first element (120) is externally threaded with a first element external thread (123). The second element (130) is mounted on, or integrally formed with, the second shank portion (1 12). The second element (130) is externally threaded with a second element external thread (133). The second element external thread (133) and the first element external thread (123) are like-handed. The first shank portion (111) and the first element (120) are configured to operate in a first mode of operation in which the shank (110) and the first element (120) are rotationally driven in unison and a second mode of operation in which the shank (110) is rotationally driven independent of the first element (120), such that the first element (120) moves along the first shank portion (111) towards the second element (130).La présente invention concerne une vis osseuse à compression (100) qui comprend une tige (110), un premier élément (120) et un deuxième élément (130). La tige (110) a des première et deuxième parties de tige longitudinalement opposées (111, 112). La première partie de tige (111) a un filetage externe avec un premier filetage de tige (113). Le premier élément (120) est monté par filetage sur la première partie de tige (111) au moyen dun filetage de premier élément interne (122) engageant par filetage le premier filetage de tige (113). Le premier élément (120) est engagé par filetage de façon externe avec un filetage de premier élément externe (123). Le deuxième élément (130) est monté sur, ou formé de façon intégrée a
