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Related Experiment Videos

Lateral angle: a method for sexing using the petrous bone.

Anna Norén1, Niels Lynnerup, Alfred Czarnetzki

  • 1Laboratory of Biological Anthropology, Institute of Forensic Medicine, University of Copenhagen, Copenhagen, DK-2200 Denmark.

American Journal of Physical Anthropology
|March 30, 2005
PubMed
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The lateral angle method accurately determines sex from skeletal remains, even fragmented or cremated bones. This forensic technique analyzes the internal auditory canal angle, achieving 83.2% accuracy in identifying sex.

Area of Science:

  • Forensic Anthropology
  • Bioarchaeology
  • Osteology

Background:

  • Sex determination from skeletal remains is crucial in forensic and archaeological contexts.
  • Traditional methods can be challenging with fragmented or cremated bones.
  • The petrous part of the temporal bone is a durable skeletal element.

Purpose of the Study:

  • To evaluate the efficacy of the lateral angle method for skeletal sex determination.
  • To assess the method's applicability to fragmented and cremated remains.
  • To compare the lateral angle method with traditional morphological sexing techniques.

Main Methods:

  • The lateral angle method measures the angle of the internal auditory canal on the petrous bone.
  • A cast of the internal acoustic canal's proximal part is used to determine the angle.

Related Experiment Videos

  • The method was tested on 113 forensic petrous bones of known sex and an archaeological sample.

    • Main Results:

    • A statistically significant difference in lateral angle size was found between males (39.3°) and females (48.2°).
    • Blind trials demonstrated an 83.2% accuracy rate for sex assignment using the lateral angle method.
    • The lateral angle method showed higher concordance with pelvic morphology-based sexing than cranial morphology-based sexing.

    Conclusions:

    • The lateral angle method is a reliable technique for sex determination from skeletal remains, particularly useful for fragmented or cremated samples.
    • The method offers a high accuracy rate and potential for subadult sexing.
    • This technique provides a valuable tool for forensic and archaeological analyses.