Morphometric study of the radius bone in a KwaZulu-Natal population: Laterality and sexual dimorphism

Abstract

Radius is sexually dimorphic bone, a relevant feature in biological profiling necessary in forensic investigations. This study aimed to record the radius morphometry and compare the radius morphometric parameters in terms of sex and laterality. Ninety-six dry-human radii bones were collected, and a total of nine morphometric measurements were recorded viz: Maximum radial length (MRL), Distal Breath (DB), Sagittal Diameter at Mid-shaft (SDM), Transverse Diameter at Mid-shaft, Vertical Head Height (HH), Minimum Head Diameter (MinHD), Maximum Head Diameter (MaxHD), Radial Head (CRH), Circumference at Radial Tuberosity (CRT). Circumference at the mean and maximum values in males was consistently higher than the female values for all parameters measured except the values in SDM and TD, where the minimum values of females + were greater on the right-hand side. For laterality, only DB (p 0.001) for both males and females, SDM for both males (p 0.013) and females (p 0.012), HH for males (p 0.042), and CRT for males (p 0.025) were statistically different. Sex and laterality remained unchanged when age was introduced as a confounding factor. This effectively means that age has no bearing on the sexual dimorphism as well as laterality of this sample. The right side consistently had greater values than the left except for HH and CRT for males without age, as well as CRT for males with age. The study concluded that the radius bone of people of the KwaZulu-Natal region is sexually dimorphic and can be used for sex determination.