Importance of Neck Boundary Condition and Posture on Cervical Spine Response Assessed using a Detailed Finite Element Human Model in a Head-First Impact.

IF 3 2区 医学 Q3 ENGINEERING, BIOMEDICAL
M I Morgan, M A Corrales, H Kaur, P A Cripton, D S Cronin
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引用次数: 0

Abstract

Purpose: Head-first impacts (HFI) are associated with a high risk of cervical spine trauma. Experimentally, HFI use an inverted full body (FB), or a head and neck with torso surrogate mass (TSM) attached to the first thoracic vertebra. FB testing is complex and few studies have been completed, while more testing has been done in the TSM configuration, no comparison of the two setups exists.

Methods: In this study, the effect of TSM and FB on the head and neck response was investigated computationally using three initial neck postures (flexed, neutral, and extended). The TSM was applied to an extracted head and neck from a contemporary full body model, while the FB was used for comparison. The models were inverted and dropped on a rigid plate at three velocities (2.0, 3.1, and 3.6 m/s). Head impact force, head and neck kinetics, vertebral kinematics, and internal energy were measured and compared between the models.

Results: TSM models demonstrated higher neck forces, and internal energy, compared to FB models. Despite similar head contact forces, the compliant thorax of the FB model reduced the neck forces and energy. The neutral and extended posture predicted higher neck forces due to facet joints engaging, while anterior head translation in the flexed posture reduced neck forces.

Conclusions: This study identified that the neck response using a TSM boundary condition differs from a FB condition, leading to higher neck loads, and that lordotic neck postures lead to higher neck forces compared to a kyphotic initial posture.

颈部边界条件和姿势对颈椎反应的重要性用头部撞击的详细有限元人体模型评估。
目的:头部撞击(HFI)与颈椎损伤的高风险相关。实验上,HFI采用倒置的全身(FB)或头颈部与躯干替代肿块(TSM)附着在第一胸椎上。FB测试比较复杂,完成的研究很少,而在TSM配置中进行了更多的测试,没有两种设置的比较。方法:在本研究中,计算研究了TSM和FB对头颈部反应的影响,采用三种初始颈部姿势(屈曲、中性和伸展)。TSM应用于从当代全身模型中提取的头颈部,而FB用于比较。将模型倒置并以三种速度(2.0、3.1和3.6 m/s)落在刚性板上。测量并比较模型之间的头部撞击力、头颈部动力学、椎体运动学和内能。结果:与FB模型相比,TSM模型显示出更高的颈部力和内能。尽管头部接触力相似,但FB模型的柔顺胸部减少了颈部的力和能量。由于关节突关节的参与,中性和伸展的姿势预示着更高的颈部力量,而屈曲姿势的前头平移减少了颈部力量。结论:本研究发现,使用TSM边界条件的颈部反应不同于FB条件,导致更高的颈部负荷,并且与后凸初始姿势相比,颈部前凸姿势导致更高的颈部力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Annals of Biomedical Engineering
Annals of Biomedical Engineering 工程技术-工程:生物医学
CiteScore
7.50
自引率
15.80%
发文量
212
审稿时长
3 months
期刊介绍: Annals of Biomedical Engineering is an official journal of the Biomedical Engineering Society, publishing original articles in the major fields of bioengineering and biomedical engineering. The Annals is an interdisciplinary and international journal with the aim to highlight integrated approaches to the solutions of biological and biomedical problems.
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