Intervertebral neck injury criterion for simulated frontal impacts.
Intervertebral neck injury criterion for simulated frontal impacts.
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模拟正面碰撞的椎间颈损伤标准。
DOI：
10.1080/15389580590931671
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Gimenez,SElena
中科院分区：
文献类型：
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作者：
Ivancic,PaulC;Ito,Shigeki;Panjabi,ManoharM;Pearson,AdamM;Tominaga,Yasuhiro;Wang,Jaw-Lin;Gimenez,SElena
目的：椎间颈损伤标准（IV-NIC）是基于超过生理极限的椎间动态运动可能损伤软组织的假设。相反，颈损伤标准（NIC）假设脊髓液压力的突然变化可能导致神经损伤。本研究的目的是利用具有肌肉力复制功能的仿生全人颈椎模型，确定每个椎间水平正面撞击导致的IV-NIC损伤阈值，并比较IV-NIC和NIC在确定损伤方面的作用。方法：使用台式仪器，模拟T1椎体在4、6、8和10 g水平加速度下的正面碰撞。损伤前后柔韧性测试测量软组织损伤情况；即，任何椎间节段的中性区或活动范围均显著增加（p < 0.05），超过相应的生理极限。结果：结果表明，软组织损伤是由于损伤的屈曲模式引起的，其阈值为8 g。C4-C5和C6-C7损伤阈值（95%置信区间）分别为2.0（1.2-2.8）和2.3 (1.6-3.0)，NIC损伤阈值为18.4 (17.9-19.0)m2/s2。NIC损伤阈值明显早于所有IV-NIC损伤阈值，表明NIC可能无法预测非生理性椎体旋转引起的小关节和软组织损伤。结论：目前的结果表明，IV-NIC通过识别椎间水平、模式、时间和损伤程度，是判断软组织颈部损伤的有效工具。
Objective:The Intervertebral Neck Injury Criterion (IV-NIC) is based on the hypothesis that dynamic intervertebral motion beyond physiological limits may injure soft tissues. In contrast, the Neck Injury Criterion (NIC) hypothesizes that sudden change in spinal fluid pressure may cause neural injuries. The goals of this study, using the biofidelic whole human cervical spine model with muscle force replication, were to determine the IV-NIC injury threshold due to frontal impact at each intervertebral level, and to compare the IV-NIC and NIC in determining injury.Methods:Using a bench-top apparatus, frontal impacts were simulated at 4, 6, 8, and 10 g horizontal accelerations of the T1 vertebra. Pre- and post-trauma flexibility testing measured the soft tissue injury; that is, a significant increase (p < 0.05) in neutral zone or range of motion at any intervertebral level, above the corresponding physiological limit.Results:Results indicated that the soft tissue injury occurred due to flexion mode of injury and its threshold was 8 g. The average IV-NIC injury threshold (95% confidence interval) was 2.0 (1.2–2.8) at C4-C5 and 2.3 (1.6–3.0) at C6-C7, while the average NIC injury threshold was 18.4 (17.9–19.0) m2/s2. The NIC injury threshold was reached significantly earlier than all the IV-NIC injury thresholds, demonstrating that the NIC may be unable to predict facet and soft tissue injury caused by non-physiologic inververtebral rotation.Conclusions:Present results suggest that IV-NIC is an effective tool for determining soft tissue neck injuries by identifying the intervertebral level, mode, time, and severity of injury.