Effect of axial angulation of sacral vestibule s1 on morphometric analysis of sacral vestibule using plain computed tomography in north west Indian population

Abstract

Background: The present study was aimed to study and develop in-depth understanding of the effect of the axial angulation of sacral vestibule S1 on morphometry of sacral vestibule in North-West Indian population presenting to our institution, which will go a long way in planning to treat the posterior pelvic injuries with percutaneous screws, thereby reducing the morbidity associated with open fixation. Methods: This study was conducted in the Department of Orthopaedics and Radiodiagnosis at Dr Rajendra Prasad Govt. Medical College, Kangra at Tanda over a period of one year. All the patients of the age >18 years and above submitting for either abdominal, lower spinal or non-orthopaedic pathology of pelvic region, presenting for computed tomography to the Department of Radiodiagnosis were included in the study.There was significant difference in axial angulation of S1 (P=0.000) and S2 (P=0.045) between males and females. Results: The axial angulation of S1 ranged from 2° to 23.0° with a mean value of 11.01°±3.74°. There was a significant difference in coronal angulation of S1 between age-groups 18-30 and 51-60 years (10.43±3.10 vs. 11.26±3.74; P=0.023).There was a weak relation between axial angulation of S1 and age-groups 18-30 years (r=0.195; P=0.013), 31-40 years (r=0.139; P=0.201), 41-50 years (r=-0.103; P=0.237), 51-60 years (r=0.013; P=0.850), and >60 years (r=-0.150;). P=0.642). There was a weak relation between interspinus distance with axial angulation of S1 (r=0.049; P=0.225). There was a weak relation between height with axial angulation of S1 (r=0.037; P=0.364). Conclusion: The present study, the first of its kind in North Western part of India arrived to help us anthropometric measurements of sacral vestibule, thereby, helping in development of local protocols for percutaneous fixation in sacral fracture.