Fig. 1
From: Ideal T1 laminar screw fixation based on computed tomography morphometry
Measurements of T1 on a transverse computed tomography (CT). a L: length based on the ideal laminar screw trajectory. A: the axial angle between the ideal laminar screw trajectory and the midline. W: the minimal outer cortical width. Ws: the minimal cancellous width. b Minimal outer cortical width (T) measured in the sagittal reconstruction at the middle 1/3 narrowest lamina. c The spinous process height (H) obtained at the site of the cross-point of the bilateral ideal laminar screw trajectory in the coronal plane