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Related Experiment Video

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Assessing Changes in Synaptic Plasticity Using an Awake Closed-Head Injury Model of Mild Traumatic Brain Injury
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Proposed Reformulation of Brain Injury Criteria (BrIC) Using Head Rotation-Induced Brain Injury Thresholds Simulated

Dominic R Demma1, Ying Tao1, Liying Zhang1

  • 1Wayne State University.

Stapp Car Crash Journal
|July 3, 2025
PubMed
Summary

The Brain Injury Criteria (BrIC) overpredicts severe traumatic brain injury (TBI). This study recalibrates BrIC using primate models, suggesting new thresholds and the need for angular acceleration and duration in injury criteria.

Keywords:
Brain Injury CriterionBrain maximum principal strainFinite element modelNon-human primateTraumatic brain injury

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Computational Modeling

Background:

  • The Brain Injury Criteria (BrIC) is a leading candidate for rotational head kinematics-based injury criteria but is known to overpredict severe traumatic brain injury (TBI).
  • Understanding the limitations of BrIC is crucial for developing accurate automotive and general safety standards.

Purpose of the Study:

  • To analyze historical primate head impact data and apply it to a finite element (FE) model to understand BrIC's overprediction.
  • To derive strain-based diffuse brain injury thresholds and recalibrate BrIC critical velocities for improved TBI prediction.

Main Methods:

  • Digitization and analysis of head impact dynamics and pathology reports from Stalnaker et al. (1977) and the Penn II baboon DAI model.
  • Computational modeling using a FE Rhesus monkey model to derive risk-related brain tissue strain thresholds.
  • Scaling BrIC critical velocities to match FE model-derived strain levels for concussion and diffuse axonal injury (DAI).

Main Results:

  • Predicted strain-based diffuse tissue injury thresholds: MPS99.9 of 1.0 for concussion (mild TBI) and 1.6 for DAI (severe TBI).
  • Identified scale factors of 1.6 to 5.9 times original BrIC critical velocities needed for predicting severe diffuse brain injury.
  • Recommended MPS99.9 and CSDM50 for post-processing strain parameters from head models.

Conclusions:

  • BrIC requires significant scaling (1.6-5.9x) to accurately predict severe diffuse brain injury.
  • Angular acceleration and duration should be incorporated into injury criteria for realistic TBI prediction.
  • The study provides a refined understanding of non-human primate models for TBI research and proposes improved methodologies for computational head injury analysis.