Change search
ReferencesLink to record
Permanent link

Direct link
The effect of muscle activation on neck response
KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
2005 (English)In: Traffic Injury Prevention, ISSN 1538-9588, Vol. 6, no 1, 67-76 p.Article in journal (Refereed) Published
Abstract [en]

Prevention of neck injuries due to complex loading, such as occurs in traffic accidents, requires knowledge of neck injury mechanisms and tolerances. The influence of muscle activation on outcome of the injuries is not clearly understood. Numerical simulations of neck injury accidents can contribute to increase the understanding of injury tolerances. The finite element (FE) method is suitable because it gives data on stress and strain of individual tissues that can be used to predict injuries based on tissue level criteria. The aim of this study was to improve and validate an anatomically detailed FE model of the human cervical spine by implement neck musculature with passive and active material properties. Further, the effect of activation time and force on the stresses and strains in the cervical tissues were studied for dynamic loading due to frontal and lateral impacts. The FE model used includes the seven cervical vertebrae, the spinal ligaments, the facet joints with cartilage, the intervertebral disc, the skull base connected to a rigid head, and a spring element representation of the neck musculature. The passive muscle properties were defined with bilinear force-deformation curves and the active properties were defined using a material model based on the Hill equation. The FE model's responses were compared to volunteer experiments for frontal and lateral impacts of 15 and 7 g. Then, the active muscle properties where varied to study their effect on the motion of the skull, the stress level of the cortical and trabecular bone, and the strain of the ligaments. The FE model had a good correlation to the experimental motion corridors when the muscles activation was implemented. For the frontal impact a suitable peak muscle force was 40 N/cm2 whereas 20 N/cm2 was appropriate for the side impact. The stress levels in the cortical and trabecular bone were influenced by the point forces introduced by the muscle spring elements; therefore a more detailed model of muscle insertion would be preferable. The deformation of each spinal ligament was normalized with an appropriate failure deformation to predict soft tissue injury. For the frontal impact, the muscle activation turned out to mainly protect the upper cervical spine ligaments, while the musculature shielded all the ligaments disregarding spinal level for lateral impacts. It is concluded that the neck musculature does not have the same protective properties during different impacts loadings.

Place, publisher, year, edition, pages
2005. Vol. 6, no 1, 67-76 p.
Keyword [en]
adult, article, cartilage, cervical spine, controlled study, cortical bone, finite element analysis, human, human experiment, intervertebral disk, ligament, male, motion, muscle contraction, muscle force, neck injury, neck muscle, normal human, skull base, stress strain relationship, trabecular bone, traffic accident, validation process, Accidents, Traffic, Biomechanics, Humans, Ligaments, Models, Biological, Movement, Neck Muscles, Spine, Stress, Mechanical
National Category
Medical Engineering
URN: urn:nbn:se:kth:diva-156808DOI: 10.1080/15389580590903203ScopusID: 2-s2.0-15344339243OAI: diva2:768330

QC 20141203

Available from: 2014-12-03 Created: 2014-12-02 Last updated: 2014-12-03Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Brolin, KarinHalldin, Peter
By organisation
Neuronic Engineering (Closed 20130701)
In the same journal
Traffic Injury Prevention
Medical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 57 hits
ReferencesLink to record
Permanent link

Direct link