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Relation between diffuse axonal injury and internal head structures on blunt impact

T Nishimoto1, S Murakami

  • 1Japan Automobile Research Institute, Ibaraki, Japan.

Journal of Biomechanical Engineering
|July 24, 1998
PubMed
Summary
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Diffuse axonal injury (DAI) can result from direct head impacts causing translational acceleration, not just rotational forces. Internal head structures significantly influence shear stress concentration, contributing to DAI occurrence.

Area of Science:

  • Biomechanics
  • Neurotrauma
  • Computational modeling

Background:

  • Diffuse axonal injury (DAI) is a severe traumatic brain injury often linked to rotational acceleration.
  • The precise injury mechanisms, particularly concerning translational impacts, require further elucidation.

Purpose of the Study:

  • To investigate the occurrence of DAI under direct impact with translational acceleration using computational head models.
  • To analyze the role of internal head structures in shear stress distribution and DAI development.

Main Methods:

  • Construction of a detailed human head model and modified versions with removed internal structures.
  • Application of blunt, lateral impacts to the third ventricle region.
  • Analysis of shear stress distribution and correlation with macroscopic DAI manifestations.

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Main Results:

  • Shear stress concentrations were observed in the corpus callosum and brain stem in the intact model, aligning with DAI lesion locations.
  • Modified models demonstrated that the falx cerebri influences corpus callosum shear stress, and the tentorium cerebelli and brain shape affect brain stem stress.
  • High shear stress in deep brain areas was linked to internal head structures.

Conclusions:

  • DAI may occur due to direct impacts causing translational acceleration, challenging the sole reliance on rotational acceleration theories.
  • Internal head structures play a critical role in concentrating shear stress, thereby influencing DAI injury mechanisms.