MORPHOMETRIC PARAMETERS OF THE AXIS RELATED TO INTRALAMINAR FIXATION

ABSTRACT Objective: To evaluate the morphometric parameters of the C2 (axis) lamina related to the intralaminar fixation technique and compare the dimensions between sexes. Methods: Descriptive anatomical study of 59 C2 vertebrae from cadavers (30 male and 29 female). Seven morphometric parameters were bilaterally measured by four independent examiners using a standard analog caliper. Statistical analysis included normality tests, t-Student, Mann-Whitney, and Kruskal-Wallis. Results: Morphometric measurements showed significant differences between sexes, with greater values in males (p<0.05). Lamina thickness was less than 4 mm in 25.20% of cases, more frequently in females. Conclusions: Intralaminar fixation of the axis must account for anatomical variations, particularly in females. Lamina thickness below 4 mm limits the safe use of 3.5 mm screws, emphasizing the need for detailed preoperative assessment. Level of Evidence IV; Descriptive Anatomical Observational Study.