A bone screw such as a pedicle screw includes an anchor portion and a sleeve portion, and the anchor portion includes an angled portion or a curved portion and a male screw portion. The sleeve portion has a male screw for engaging with the bone and an internal screw hole for engaging with the male screw portion of the anchor portion. [Selection] Figure 20椎弓根ねじ等の骨ねじは、アンカー部及びスリーブ部を備え、該アンカー部は角度付き部又は湾曲部と、雄ねじ部を含んでいる。該スリーブ部は、骨に係合するための雄ねじと、該アンカー部の該雄ねじ部に係合するための内部ねじ穴を有する。【選択図】図２０
