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Morphological variations of the ulnar styloid process.

A Biyani1, A Mehara, S Bhan

  • 1Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi.

Journal of Hand Surgery (Edinburgh, Scotland)
|August 1, 1990
PubMed
Summary

This study analyzed 400 wrist radiographs, identifying five ulnar styloid process variations. Elongated styloid processes were most common, with no link found to ulnar variance.

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Area of Science:

  • Radiology
  • Anatomy
  • Orthopedics

Background:

  • The styloid process of the ulna is a critical anatomical landmark.
  • Understanding its morphology is essential for diagnosing wrist conditions.

Purpose of the Study:

  • To investigate the morphological variations of the ulnar styloid process in a normal population.
  • To establish the prevalence of different ulnar styloid process configurations.

Main Methods:

  • Posteroanterior (P.A.) radiographs of both wrists were obtained from 400 healthy individuals.
  • Morphological variations of the ulnar styloid process were systematically classified.

Main Results:

  • Five distinct morphological variations of the ulnar styloid process were identified.
  • The most frequent variation was an elongated process (observed in 102 wrists).
  • Less common variations included medially deviated (41 wrists), parrot-beaked (27 wrists), and hypertrophic (16 wrists) patterns.

Conclusions:

  • The study provides a detailed classification of ulnar styloid process morphology in a normal cohort.
  • No correlation was found between the length of the styloid process and ulnar variance.
  • These findings contribute to anatomical knowledge and may aid in interpreting radiographic findings.

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