Mild traumatic brain injury and diffuse axonal injury in swine
Open accessAbstract
Until recently, mild traumatic brain injury (mTBI) or "concussion" was generally ignored as a major health issue. However, emerging evidence suggests that this injury is by no means mild, considering it induces persisting neurocognitive dysfunction in many individuals. Although little is known about the pathophysiological aspects of mTBI, there is growing opinion that diffuse axonal injury (DAI) may play a key role. To explore this possibility, we adapted a model of head rotational acceleration in swine to produce mTBI by scaling the mechanical loading conditions based on available biomechanical data on concussion thresholds in humans. Using these input parameters, head rotational acceleration was induced in either the axial plane (transverse to the brainstem; n=3), causing a 10- to 35-min loss of consciousness, or coronal plane (circumferential to the brainstem; n=2), which did not produce a sustained loss of consciousness. Seven days following injury, immunohistochemical analyses of the brains revealed that both planes of head rotation induced extensive axonal pathology throughout the white matter, characterized as swollen axonal bulbs or varicosities that were immunoreactive for accumulating neurofilament protein. However, the distribution of the axonal pathology was different between planes of head rotation. In particular, more swollen axonal profiles were observed in the brainstems of animals injured in the axial plane, suggesting an anatomic substrate for prolonged loss of consciousness in mTBI. Overall, these data support DAI as an important pathological feature of mTBI, and demonstrate that surprisingly overt axonal pathology may be present, even in cases without a sustained loss of consciousness.
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Concussion is thought to be a type of DAI because axons may be injured due to stretching.
“As a neuropathological definition, concussion is thought to be a type of DAI because axons may be injured due to stretching (104, 105).”
From Pituitary Dysfunction After Traumatic Brain Injury: A Clinical and Pathophysiological Approach (2015) · cites this paper as [104]
The Discussion describes DAI as an important pathological feature of mild TBI or concussion and says axonal deformation may mechanically damage axons. It does not define concussion itself as a type of DAI; the Discussion cautions that the scope of the DAI designation in mild TBI remains uncertain. (LLM, conf=0.84)
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- Authors
- Browne, K. D., Chen, X.-H., Meaney, D. F., & Smith, D. H.
- Affiliations
- University of Pennsylvania (US)
- Center for Brain Injury and Repair, Department of Neurosurgery, University of Pennsylvania, Philadelphia, Pennsylvania.
- Corresponding author
- Smith, Douglas H.
- Venue
- Journal of Neurotrauma
- Publisher
- SAGE Publications
- Published
- 2011-09
- Volume
- 28
- Issue
- 9
- Pages
- 1747-1755
- ISSN
- 0897-7151 (ISSN-L)
- 1557-9042
- PMC
- PMC3172883
- OpenAlex
- W2064707507
- Cited by
- 248
- References
- 59
- Citations by year
- 2026: 6 · 2025: 10 · 2024: 11 · 2023: 20 · 2022: 16 · 2021: 17 · 2020: 19 · 2019: 21 · 2018: 24 · 2017: 20 · 2016: 24 · 2015: 18 · 2014: 14 · 2013: 12 · 2012: 12
- FWCI
- 9.84
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Journal of Neurotrauma (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (NS08803, NS‐056202)
- National Institute of Neurological Disorders and Stroke (NS-038104, R01NS038104, NS-08803, P01NS056202, NS 056202)
- Topics
- Health Sciences › Medicine › Epidemiology › Traumatic Brain Injury Research
- Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Automotive and Human Injury Biomechanics
- Keywords
- mild traumatic brain injury, concussion, diffuse axonal injury, porcine model, axonal pathology, neurofilaments, white matter, brainstem, loss of consciousness, neurocognitive impairment
- MeSH terms
- Acceleration, Animals, Brain, Brain Concussion, Rotation, Swine, Unconsciousness, Diffuse Axonal Injury
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