Systems and methods for treating bone

The present invention provides a nut (106) for treating bone, the nut comprising: a head (114) and a body extending longitudinally from the head (114) to a free end and comprising a channel extending longitudinally from the free end therein, the channel (136) configured to engage an end of a bone screw; and an external thread (120) extending around the body from the body outer surface along its entire length, an outer profile (150) of the external thread (120) being defined via a radially outermost edge (122) of the external thread, a first portion (142) of the outer profile (150) adjacent the head portion has a diameter smaller than a second portion (144) of the outer profile (150) extending from the first portion to the free end (134) of the body. 本发明提供了一种用于治疗骨的螺母(106)，该螺母包括：头部(114)和从该头部(114)纵向延伸到自由端并包括从该自由端纵向延伸到其中的通道的主体，该通道(136)被配置成接合骨螺钉的端部；以及从该主体外表面沿其整个长度围绕该主体延伸的外螺纹(120)，该外螺纹120)的外部轮廓(150)经由该外螺纹的径向最外边缘(122)限定，与该头部部分相邻的该外部轮廓(150)的第一部分(142)具有小于从该第一部分延伸到该主体的该自由端(134)的该外部轮廓(150)的第二部分(144)的直径。