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External occipital protuberance classification with special reference to spine type and its clinical implications.

Anjali Singal1, Priti Chaudhary2, Paramdeep Singh3

  • 1Department of Anatomy, All India Institute of Medical Sciences, Bathinda, Punjab, 151001, India. anjali_singal@rediffmail.com.

Surgical and Radiologic Anatomy : SRA
|March 22, 2023
PubMed
Summary

This study classified external occipital protuberance (EOP) types in cadaveric skulls, finding Type 3 (spine type) in 6.5%. Morphometric analysis of EOP provides valuable data for clinical management and radiological interpretation.

Keywords:
External occipital protuberanceOccipital headacheOccipital spurSpinous

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Area of Science:

  • Anatomy
  • Radiology
  • Biomechanics

Background:

  • External occipital protuberance (EOP) variations can impact neck biomechanics and cause headaches.
  • Accurate classification and morphometric analysis of EOP are crucial for clinical diagnosis and treatment.

Purpose of the Study:

  • To classify external occipital protuberance (EOP) types in dry human skulls.
  • To specifically analyze Type 3 EOP (spinous type) morphology.
  • To provide data for improved clinical management of occipital headaches and radiological interpretations.

Main Methods:

  • Classification of EOP types in 31 dry cadaveric skulls.
  • Morphometric measurements (length, width, thickness, volume) of Type 3 EOP using direct skull measurements and CT scans.
  • Assessment of superior nuchal lines and external occipital crest prominence.

Main Results:

  • EOP Type 1: 42%, Type 2: 51.5%, Type 3: 6.5%.
  • Superior nuchal lines and external occipital crest were more prominent in Types 2 and 3 EOP.
  • Type 3 EOP spine measurements: mean length 16.63 mm, width 20.1 mm, thickness 7.82 mm; mean CT volume 0.95 cm³.

Conclusions:

  • Plain lateral radiography is reliable for measuring spinous EOP length and thickness.
  • EOP morphometry (length, thickness) does not always correlate with EOP volume.
  • Detailed EOP morphology data is essential for neurosurgeons, sports physicians, emergency departments, and radiologists.