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Discriminant function sexing of the tibia.

M Y Işcan, P Miller-Shaivitz

    Journal of Forensic Sciences
    |October 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    This study developed a new method for sex determination using tibia bone dimensions, achieving high accuracy. Bone dimorphism varied by race, indicating genetic factors influence sex differences in skeletal morphology.

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    Area of Science:

    • Forensic Anthropology
    • Human Osteology
    • Biological Anthropology

    Background:

    • Sexual dimorphism in skeletal dimensions is well-documented, particularly in the femur.
    • The tibia's potential for sex determination using shaft dimensions requires further investigation.
    • Understanding racial variations in skeletal dimorphism is crucial for accurate forensic analysis.

    Purpose of the Study:

    • To compare the sexual dimorphism of tibia shaft dimensions with that of the femur.
    • To develop and validate a novel sex determination technique utilizing tibial osteometric measurements.
    • To assess the influence of race on tibial sexual dimorphism and sex determination accuracy.

    Main Methods:

    • Utilized a stepwise discriminant function analysis on 159 tibiae from the Terry Collection (Black and White individuals).

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  • Collected osteometric data including length, proximal/distal breadths, circumferences (nutrient foramen, smallest shaft), and diameters (anteroposterior, transverse) at the nutrient foramen.
  • Analyzed which variables best predicted sex within different racial groups.

    • Main Results:

    • Proximal epiphyseal breadth and minimum shaft circumference were key predictors in Black individuals.
    • Most dimensions, except transverse diameter, were significant predictors in White individuals.
    • Achieved average sex determination accuracies of 87.3% for Whites and 90.0% for Blacks.
    • Proximal epiphysis dimensions showed greater sexual dimorphism than other tibial measurements across both races.

    Conclusions:

    • Tibia shaft dimensions exhibit sexual dimorphism, though its extent is race-dependent.
    • The developed discriminant functions provide statistically reliable sex determination from the tibia.
    • Accurate sex determination necessitates considering not only growth and activity but also the genetic (racial) background of the population.