“…According to several reported anatomic 14,18,31) and clinical studies 6,8,16,23,26,30) , the two most popular types of lateral mass screw techniques are the Roy-Camille technique, in which the screw is inserted perpendicular to the posterior surface of the lateral mass, and the Magerl technique, in which the screw is directed 25 degrees laterally and parallel to the superior facet joint. The Roy-Camille technique is associated with a higher Objective : Our purpose of this study is to compare insertion angles and screw lengths from Roy-Camille, Magerl, and our designed method for cervical lateral mass screw fixation in the Korean population by quantitative measurement of reformatted two dimensional (2D) computed tomography (CT) images.…”