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Anatomy Research International
Volume 2014 (2014), Article ID 425868, 9 pages
Research Article

Morphometric Analysis of Lateral Masses of Axis Vertebrae in North Indians

1Department of Anatomy, Sri Guru Ram Das Institute of Medical Science and Research, Vallah, Amritasr 143001, Punjab, India
2Department of Pathology, Sri Guru Ram Das Institute of Medical Science and Research, Vallah, Amritasr 143001, Punjab, India
3Department of Anatomy, Government Medical College, Amritsar, Punjab, India

Received 28 May 2014; Accepted 30 July 2014; Published 24 August 2014

Academic Editor: Udo Schumacher

Copyright © 2014 Monika Lalit et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background and Objective. The lateral masses of axis have good cancellous bone quality beneath the articular surface of facets that make this area a good site for the insertion of an internal fixation device. Methods. 60 dry axis vertebrae were obtained for anatomic evaluation focused on pedicle, superior and inferior articular facets, and foramen transversarium. Based upon linear and angular parameters the mean, range, and standard deviation were calculated. Results. The mean length, width, and height of the pedicle were 21.61 ± 2.37 mm, 8.82 ± 2.43 mm, and 5.63 ± 2.06 mm. The mean pedicle superior angle and median angle were 23.3 and 32.2 degrees. The mean superior articular facet length, width, and external and internal height were 16.34 ± 1.56 mm, 14.35 ± 1.75 mm, 8.98 ± 1.36 mm, and 4.23 ± 0.81 mm. Depth of vertebral artery was 4.72 ± 0.83 mm. Mean inferior articular facet length and width were 11.13 ± 1.43 mm and 7.89 ± 1.30 mm. The mean foramen transversarium length and width were 5.11 ± 0.91 mm and 5.06 ± 1.23 mm. Conclusions. The study may provide information for the surgeons to determine the safe site of entry and trajectory for the screw implantation and also to avoid injuries to vital structures while operating around axis.