The present disclosure provides a particularly bone screw (2) is a pedicle screw, the male screw (10) is provided, the screw shaft to help the bone screw (2) to secure into the bone (20) and (4), the screw head portion provided at the proximal end of the screw shaft (4) and (6), relates to a bone screw (2) provided with. According to the present invention, in the region of the proximal screw shaft portion (the A), or incomplete thread portion, the screw outer diameter (D A ) and screw root diameter (D K the ratio of the ) increases toward the screw head (6)本開示は、特に椎弓根スクリュである骨ねじ(2)であって、雄ねじ(10)が設けられ、骨ねじ(2)を骨(20)内に固定するのに役立つスクリュシャフト(4)と、スクリュシャフト(4)の近位端に設けられたスクリュ頭部(6)と、を備える骨ねじ(2)に関する。本発明によれば、近位スクリュシャフト部分(A)、又は不完全ねじ部の領域において、ねじ外径(DA)とねじ谷径(DK)との比率がスクリュ頭部(6)に向かって増加する。
