Sex Assessment Using Mid-Sagittal Measurements of the First Sacral Vertebra, MRI Study
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چکیده
Background: Determination of sex from the skeletal remains is of vital medicolegal importance for establishing the identity of an individual. Aims: To study the sexual differences in the first sacral vertebra (S1) in middle-aged adults through devising new parameters and indices. Materials and Methods: 100 mid-sagittal MR images of lumbosacral region (50 males "35±6 years" and 50 females "32±6 years") were investigated. The dimensions of S1 as well as inclination angles of sacrum were measured and statistically analyzed. Results: Male S1 showed higher values than that of female S1 in all of the investigated parameters, except for LSA. The parameters showed sex differences of variable levels. Also, Index 1(ID/SD×100) and Index 2 (PH/AH×100) showed significant sex differences. Application of univariate ANOVA revealed an accuracy in assigning sex of S1 for 95% of the cases, with accurate predictions being made for 97.5% of females and 92.5% of males. Conclusions: The body of the first sacral vertebra (S1) is a good bone for sex determination. The newly devised MRI parameters of S1 might be used to aid in identification of human skeletal and fleshed remains.
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