To Study The Correlation Between Foramen Magnum Index And Cranial Index In Indian Population

Purpose: The cranium base is complex, as well as extremely attractive. The foramenmagnum is an important characteristic of cranium base. A transcondylar surgicalmethod requires knowledge of the anatomical features of this region. Foramen magnumindex and cranial index were evaluated to establish a correlation, if any, between thedimensions of skull and foramen magnum and an attempt was made to provide abaseline data for better surgical approach in this region so that overall morbidity andmortality could be minimized.Material and Methods: Various diameters of foramen magnum and of craniumwere examined to calculate the two index using an electronic digital sliding caliper in120 adult North Indian dry skulls of unknown age and gender.Results: The mean Foramen Magnum Index (FMI) was 78.715.94. The mean cranialindex was found to be 73.827.06.The p-value is >0.05, r = 0.004 (Weak correlation)indicating a weak correlation between two parameters.Conclusion: The results primarily help the anatomists and a medico-legal expert tofind out the cranial index from the Foramen Magnum Index through the provision ofbase line data. Secondly, it provides an important information to clinicians and neurosurgeonsto approach the cranial base with maximum safety and minimal mortalityand morbidity.Key words: Foramen Magnum–Foramen Magnum Index–Variation–Cranial index.