TY  - JOUR
A1  - Mahato, Niladri Kumar 
T1  - Maximal rotation at atlanto-axial joint: analysis of changes in mid-sagittal space within atlas vertebra
JO  - Eur. J. Anat.
SN  - 1136-4890
Y1  - 2010
VL  - 14
SP  - 127
EP  - 132
UR  - http://www.eurjanat.com/web/paper.php?id=100020nk
KW  - Atlanto-axial
KW  - Dens
KW  - Translation
KW  - Space occupying lesion
N2  - The present study was conducted to analyses changes that may occur in the available antero-posterior dimension (behind the dens) within the ring of the atlas vertebra resulting from optimal axial rotation of the neck. Radiographs were at obtained from twentyfive healthy volunteers of both sexes between the age group 25-50 years. The subjects recruited for the study were healthy individuals, with no any history of major ailments of the spine and did not show any unilateral or bilateral restriction of axial rotation at the neck. Outcome measures were evaluated by data obtained with and without axial rotation and were statistically compared for difference in means, their ratios, correlation and dependence. The anterior (AS) as well as the posterior spaces (PS) available respectively in front of and behind the odontoid process reduced in rotation. The reduction at the PS (average .89 mm) was 4.10 % of the available space observed without rotation. Although the reduction at the PS may not compress the spinal cord, extreme axial rotation with flexion may possibly compress the contents of the spinal canal, where atlas rings are smaller or accommodate a space-occupying lesion.
ER  -