Applicability and reliability of foramen magnum for sex determination in contemporary Western Indian population: A computed tomographic study

Establishing sex of fragmentary skeletal remains is a critical issue in forensic anthropology and is of prime importance, since it helps to significantly narrow down the number of potential victims. Forensic anthropologists have always advocated for population specific sex discriminant formula for each population using different skeletal parts. Till date Gujarati population of India has not have any discriminant formulae for sex determination from fragmentary crania. So, the current research aims to examine the usefulness of foramen magnum variables in sex estimation of Western Indian (Gujarati) population and to provide population data which can be used as reference in cases of establishing identity in unknown fragmentary skulls.

A total of 553 adult individuals [♂ = 291, ♀ = 262] of Gujarati origin with age range 18–60 years were subjected to Computed Tomography (CT) scan of skull. Length and width of foramen magnum were measured and based on these, three other variables (areas by Radinsky and Teixeria formulae and foramen magnum index) were calculated. Descriptive and discriminant function analysis was performed using SPSS 20.00.

Significant difference was observed in all variables except foramen magnum index, but sexing accuracy didn't exceed 69.1%, even after using multivariate discriminant analysis. It is concluded that the foramen magnum region is not suitable for sexing Gujarati population in forensic context.