Impact of Axial Angulation of Sacral Vestibule S2 on Sacral Vestibule Morphometry: A Plain CT Based Study North West Indian Population

Background: The present study was done to analyze of the impact of the axial angulation of sacral vestibule S2 on morphometry of sacral vestibule in North-West Indian population scanned in our institute, which will help us in planning to operate the posterior pelvic fractures with closed fixation, thereby avoiding the hazards of open fixation.

Methods: This study was done in the Department of Orthopaedics and Radiology at Dr Rajendra Prasad Govt. Medical College, Kangra at Tanda over a period of one year. All the patients of the age more than 18 years submitting for either abdominal or of pelvic pathology, presenting for CT scans to the Department of Radiology in the institute were studied.

Results: The axial angulation of S2 ranged from -1° to 8° with a mean of 3.51°±2.88° respectively. There was found significant difference in axial angulation of S2 between age-groups 18-30 and 41-50 years (2.77±1.95 vs. 3.45±2.90; P=0.018), age-groups 18-30 and 51-60 years (2.77±1.95 vs. 3.0±3.46; P=0.001).There was found weak relation between axial angulation of S2 and age-groups 18-30 years (r=0.029; P=0.720), 31-40 years (r=0.009; P=0.937), 41-50 years (r=0.105; P=0.227), 51-60 years (r=0.020; P=0.772) and >60 years (r=-0.226; P=0.479).There existed significant difference in axial angulation of S2 (P=0.045) between males and females. There existed weak relation between interspinous distance with axial angulation of S2 (r=0.011; P=0.781).There was found week relation between height with axial angulation of S2 (r=-0.034; P=0.406).

Conclusion: This study is the first study of sacral vestibule S2 in North Western part of India which will help us to study anthropometry of sacral vestibule S2, thereby and will help us for planning to operate the posterior pelvic fractures with closed fixation, thereby avoiding the hazards of open fixation.