An extensive review of the literature has revealed a limited pedicle study of the sacrum in Indian population. The present study analyses a very significant variation in the values, as regards the racial/ regional differences. Our study cover morphometric details of the 1st pedicle of sacrum for pedicle screw placement. We intend to study for safe entry of pedicle screw including finding the screw depth in Navi Mumbai population. Boucher in 1959 was the first to use pedicle screws. There has

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... n an almost continuous development in the field of spinal instrumentation by various surgeons. Materials and Methods: The study was done on 30 dry human sacra and 30 cadaver sacral bones which were collected from Department of Anatomy, M.G.M. Medical College, and Terna medical college. Result: No significant difference in posterior pedicle height was seen in both genders. Anteroposterior length and width were higher on both sides in males. Anteroposterior length of alae on both sides in both genders were of almost of equal thickness. Conclusion: Our study brings forth valuable data from a population of Navi Mumbai, which can be of use for operating surgeons and interventionists. Our study revealed racial and regional variation with a comparison to other country studies.