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Identification from dorsal finger pattern: a new approach.

Saurabh Chattopadhyay1, Biswajit Sukul

  • 1Department of Forensic Medicine, Medical College, Kolkata, India. chattopadhyaydrs@rediffmail.com

Medicine, Science, and the Law
|March 9, 2012
PubMed
Summary

This study explores dorsal finger patterns from skin creases on proximal inter-phalangeal joints for personal identification. The dorsal finger pattern analysis achieved 91.9% accuracy in confirming identity.

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Area of Science:

  • Forensic Science
  • Dermatoglyphics
  • Human Identification

Background:

  • The dorsal aspect of the hand, specifically finger skin creases, remains an understudied area for personal identification.
  • Existing identification methods often overlook the unique patterns formed by creases over the proximal inter-phalangeal joints.

Purpose of the Study:

  • To investigate the feasibility of using dorsal finger patterns (skin creases on proximal inter-phalangeal joints) for personal identification.
  • To analyze the characteristics and prevalence of different dorsal finger crease patterns in a Bengali population.

Main Methods:

  • Photographic documentation of the dorsal aspects of fingers from 257 native Bengali subjects (140 males, 117 females) in Kolkata.
  • Digital image analysis using Microsoft Photoeditor to study skin creases over proximal inter-phalangeal joints in three segments (proximal, middle, distal).

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  • Classification of dorsal finger patterns based on stem types (horizontal, vertical, oblique, semi-lunar, mixed) and branching patterns (body, terminal).

    • Main Results:

    • A total of 7710 segments were analyzed, revealing five basic stem types: horizontal, vertical, oblique, semi-lunar, and mixed.
    • Horizontal stems were the most prevalent (90.49%), while semi-lunar stems were the rarest (<1%).
    • Body branching was more common than terminal branching, and the overall accuracy for identity confirmation reached 91.9%.

    Conclusions:

    • Dorsal finger patterns, derived from skin creases over proximal inter-phalangeal joints, demonstrate significant potential as a reliable method for personal identification.
    • The study establishes a baseline for dorsal finger pattern characteristics in the Bengali population, supporting its application in forensic identification.