Influence of the body and neck on head kinematics and brain injury risk in bicycle accident situations

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Fahlstedt, Madelen¹; Halldin, Peter¹; Alvarez, Victor S.¹; Kleiven, Svein¹

Influence of the body and neck on head kinematics and brain injury risk in bicycle accident situations

Proceedings of the 2016 International IRCOBI Conference on the Biomechanics of Injury

Affiliations

¹Neuronic Engineering, School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden
Abstract and keywords

Previous studies about the influence of the neck on head kinematics and brain injuries have shown different results. Today bicycle helmets are certified with only a headform in radial experiments but could be improved with oblique impacts. Then the question is how the helmet’s performance will be affected by the neck and the rest of the body. Therefore, the objective of this study was to use finite element simulations to investigate the influence of the body on head kinematics and injury prediction in single bicycle accident situations with and without a helmet. The THUMS-KTH model was used to study the difference between head only and full body. In total, a simulation matrix of 120 simulations was compared by altering initial impact posture, head protection, and muscle activation. The results show that the body in impacts against a hard surface can change the amplitudes and curve shapes of the kinematics and brain tissue strain. The study found an average ratio between head only and full body for peak brain tissue strain to be 1.04 (SD 0.11), for peak linear acceleration 1.06 (SD 0.04), for peak angular acceleration 1.08 (SD 0.09) and for peak angular velocity 1.05 (SD 0.13).

Keywords: bicycle, brain injuries, head, helmet, neck
Links

URL: http://www.ircobi.org/wordpress/downloads/irc16/pdf-files/64.pdf

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Cited By (13)

Year	Entry
2019	Katsuhara T, Yamamae Y, Yasuki T, Umetani H. Analysis of kinematcis and head injury mechannisms in car to child cyclsit collision simulation using human finite element model. In: Proceedings of the 26th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 10-13, 2019; Eindhoven, Netherlands.
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2017	Deck C, Bourdet N, Halldin P, DeBruyne G, Willinger R. Protection capability of bicycle helmets under oblique impact assessed with two separate brain FE models. In: Proceedings of the 2017 International IRCOBI Conference on the Biomechanics of Injury. September 13-15, 2017; Antwerp, Belgium.190-200.
2017	Klug C, Feist F, Raffler M, Sinz W, Petit P, Ellway J, van Ratingen M. Development of a procedure to compare kinematics of human body models for pedestrian simulations. In: Proceedings of the 2017 International IRCOBI Conference on the Biomechanics of Injury. September 13-15, 2017; Antwerp, Belgium.508-530.
2018	Fahlstedt M, Kleiven S, Li X. The influence of the body on head kinematics in playground falls for different age groups. In: Proceedings of the 2018 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2018; Athens, Greece.336-337.
2018	Bland ML, McNally C, Rowson S. Headform and neck effects on dynamic response in bicycle helmet oblique impact testing. In: Proceedings of the 2018 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2018; Athens, Greece.413-423.
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2018	Meng S, Fahlstedt M, Halldin P. The effect of impact velocity angle on helmeted head impact severity: a rationale for motorcycle helmet impact test design. In: Proceedings of the 2018 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2018; Athens, Greece.454-469.
2020	Kofler D, Tomasch E, Spitzer P, Klug C. Analysis of the effect of different helmet types and conditions in two real-world accident scenarios with a human body model. In: Proceedings of the 2020 International IRCOBI Conference on the Biomechanics of Injury. 2020; Munich, Germany.1-26.
2022	Lindgren N, Halldin P, Fahlstedt M. Influence of headform on assessments and ratings of the protective performance of bicycle helmets. In: Proceedings of the 2022 International IRCOBI Conference on the Biomechanics of Injury. September 14-16, 2022; Porto, Portugal.892-911.
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2019	Bland ML. Assessing the Efficacy of Bicycle Helmets in Reducing Risk of Head Injury [PhD thesis]. Virginia Polytechnic Institute and State University; March 28, 2019.