Morphometric Analysis of Axis Vertebra for Atlantoaxial Fixation in Northeastern Brazil

This is the authors' abstract. We don't add key points for this paper.

Introduction: the axis is the second cervical vertebra and differs from other vertebrae by presenting particular anatomical accidents. Variations in axis morphology in different populations have clinical importance, especially in atlantoaxial fixation, since the lack of anatomical reference may compromise surgical procedures in this region. Purpose: to analyze the morphometry of axis vertebra and its clinical applications in Northeastern Brazil. Methodology: fifty-eight axis vertebrae from the Human Anatomy Laboratory of the Federal University of Paraba (UFPB) were used in this study. Morphometric analysis was performed using a digital caliper and data were statistically analyzed. The results were considered significant when p<0.05. Results: the mean width of the isthmus of the pars interarticularis was 9.251.68 mm and the height was 7.371,87 mm. The mean height of the dens of the axis in an anterior view was 16.291.82 mm and the width was 9.410.86 mm. The width of the articular face of the axis dimples was 8.270.88 mm. The average anteroposterior length of the vertebral body was 15.292.02 mm, the width was 16.791.68 and the height in an anterior view was 19.962.48 mm. The average height of the vertebral lamina was 10.891.64 mm and the anteroposterior length was 20.332.13 mm. Significant difference was observed between right and left sides of anteroposterior length (p=0.012). Conclusion: it was showed for the first time the axis morphometry in a specific population of Northeast Brazil. Morphological differences were observed in the present study and diverge from others in the literature. This data can serve as guidance for professionals who will perform atlantoaxial fixation in this region, highlighting the importance of anatomical knowledge and its variations.