Evidence map›Paper›PMID 33870238›Full record

ArticleBrain multiphysics2020

In vivo estimates of axonal stretch and 3D brain deformation during mild head impact.

Andrew K Knutsen, Arnold D Gomez, Mihika Gangolli, Wen-Tung Wang, Deva Chan, Yuan-Chiao Lu, Eftychios Christoforou, Jerry L Prince, Philip V Bayly, John A Butman and 1 more

Open access · goldAbstract read
In one paragraph

Article in Brain multiphysics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed
5.7field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

31 citing papers in PubMed, 71 citations in OpenAlex.

  1. Article
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  3. Multimodal characterization of intracranial biomechanics in a 3D biofidelic head surrogate.Journal of the mechanical behavior of biomedical materials · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 7 institutions in 2 countries.

Andrew K KnutsenCenter for Neuroscience and Regenerative Medicine, The Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
Arnold D GomezDepartment of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Mihika GangolliCenter for Neuroscience and Regenerative Medicine, The Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
Wen-Tung WangCenter for Neuroscience and Regenerative Medicine, The Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
Deva ChanDepartment of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA.
Yuan-Chiao LuCenter for the Developing Brain, Children's National Hospital, Washington, D.C., USA.
Eftychios ChristoforouDepartment of Mechanical and Manufacturing Engineering, University of Cyprus, Cyprus.
Jerry L PrinceDepartment of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland, USA.
Philip V BaylyDepartment of Mechanical Engineering and Materials Science, Washington University in St. Louis, Missouri, USA.
John A ButmanClinical Center, National Institutes of Health, Bethesda, Maryland, USA.
Dzung L PhamCenter for Neuroscience and Regenerative Medicine, The Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
Henry M. Jackson Foundation · USJohns Hopkins University · USChildren's National · USNational Institutes of Health Clinical Center · USRensselaer Polytechnic Institute · USUniversity of Cyprus · CYWashington University in St. Louis · US

Funding

IN VIVO MEASUREMENT OF BRAIN BIOMECHANICSR01NS055951 · NINDS · WASHINGTON UNIVERSITY · PI BAYLY, PHILIP V · 2007 to 2017
$3.9M
MRI Measurement of the Mechanical Vulnerability of the BrainU01NS112120 · NINDS · WASHINGTON UNIVERSITY · PI BAYLY, PHILIP V · 2019 to 2023
$3.7M
In Vivo Measurement of Brain BiomechanicsR56NS055951 · NINDS · WASHINGTON UNIVERSITY · PI BAYLY, PHILIP V · 2018 to 2018
$563k
NINDS NIH HHS R01 NS055951NINDS NIH HHS R56 NS055951NINDS NIH HHS U01 NS112120
6 · The paper itself

Abstract

The rapid deformation of brain tissue in response to head impact can lead to traumatic brain injury. In vivo measurements of brain deformation during non-injurious head impacts are necessary to understand the underlying mechanisms of traumatic brain injury and compare to computational models of brain biomechanics. Using tagged magnetic resonance imaging (MRI), we obtained measurements of three-dimensional strain tensors that resulted from a mild head impact after neck rotation or neck extension. Measurements of maximum principal strain (MPS) peaked shortly after impact, with maximal values of 0.019-0.053 that correlated strongly with peak angular velocity. Subject-specific patterns of MPS were spatially heterogeneous and consistent across subjects for the same motion, though regions of high deformation differed between motions. The largest MPS values were seen in the cortical gray matter and cerebral white matter for neck rotation and the brainstem and cerebellum for neck extension. Axonal fiber strain (Ef) was estimated by combining the strain tensor with diffusion tensor imaging data. As with MPS, patterns of Ef varied spatially within subjects, were similar across subjects within each motion, and showed group differences between motions. Values were highest and most strongly correlated with peak angular velocity in the corpus callosum for neck rotation and in the brainstem for neck extension. The different patterns of brain deformation between head motions highlight potential areas of greater risk of injury between motions at higher loading conditions. Additionally, these experimental measurements can be directly compared to predictions of generic or subject-specific computational models of traumatic brain injury.

Indexed as

axonal strainbrain biomechanicstagged MRItraumatic brain injury

Identifiers

PMID33870238
PMCPMC8049176
OpenAlexW3082087714

What OpenQuestion holds

Textmetadata
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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.