NDLI: Head impact accelerations for brain strain-related responses in contact sports: a model-based investigation

Content Provider	Springer Nature Link
Author	Ji, Songbai Zhao, Wei Li, Zhigang McAllister, Thomas W.
Copyright Year	2014
Abstract	Both linear $$(\mathbf{a}_{\mathrm{lin}})$$ and rotational $$(\mathbf{a}_{\mathrm{rot}} )$$ accelerations contribute to head impacts on the field in contact sports; however, they are often isolated in injury studies. It is critical to evaluate the feasibility of estimating brain responses using isolated instead of full degrees-of-freedom (DOFs) accelerations. In this study, we investigated the sensitivities of regional brain strain-related responses to resultant $$\mathbf{a}_{\mathrm{lin}}$$ and $$\mathbf{a}_{\mathrm{rot}}$$ as well as the relative contributions of these acceleration components to the responses via random sampling and linear regression using parameterized, triangulated head impacts with kinematic variable values based on on-field measurements. Two independently established and validated finite element models of the human head were employed to evaluate model-consistency and dependency in results: the Dartmouth Head Injury Model and Simulated Injury Monitor. For the majority of the brain, volume-weighted regional peak strain, strain rate, and von Mises stress accumulated from the simulation significantly correlated with the product of the magnitude and duration of $$\mathbf{a}_{\mathrm{rot}}$$ , or effectively, the rotational velocity, but not to $$\mathbf{a}_{\mathrm{lin}}$$ . Responses from $$\mathbf{a}_{\mathrm{rot}}$$ -only were comparable to the full-DOF counterparts especially when normalized by injury-causing thresholds (e.g., volume fractions of large differences virtually diminished (i.e., $$<$$ 1 %) at typical difference percentage levels of 1–4 % on average). These model-consistent results support the inclusion of both rotational acceleration magnitude and duration into kinematics-based injury metrics and demonstrate the feasibility of estimating strain-related responses from isolated $$\mathbf{a}_{\mathrm{rot}}$$ for analyses of strain-induced injury relevant to contact sports without significant loss of accuracy, especially for the cerebrum.
Starting Page	1121
Ending Page	1136
Page Count	16
File Format	PDF
ISSN	16177959
Journal	Biomechanics and Modeling in Mechanobiology
Volume Number	13
Issue Number	5
e-ISSN	16177940
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Traumatic brain injury Contact sports Concussion Finite element model Rotational acceleration Linear acceleration Dartmouth Head Injury Model Theoretical and Applied Mechanics Biomedical Engineering Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Modeling and Simulation Biotechnology

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