Department of Biomedical Engineering, Wayne State University, USA.
Department of Biomedical Engineering, Wayne State University, USA.
J Mech Behav Biomed Mater. 2019 Dec;100:103398. doi: 10.1016/j.jmbbm.2019.103398. Epub 2019 Aug 19.
In a study of spine injuries in Operation Iraqi Freedom (OIF) and Operation Enduring Freedom (OEF) from 2001-09, spinal fractures sustained by mounted soldiers accounted for 26% of all injuries, and of that, 43% were caused by explosions [1]. The thoracolumbar region is the most vulnerable area of the spine [2], and injuries are often incapacitating, making egress from vehicles difficult. Injury prediction from such events continues to remain a challenge due to the limited availability of studies specifically focused on underbody blasts (UBB) and criteria on related injuries. This study focuses on developing and validating the spine response of an updated 50th percentile male Global Human Body Models Consortium (GHBMC) Finite Element (FE) model using instrumented post-mortem human subject (PMHS) laboratory tests under two unique conditions. The model was validated against response corridors created using scaled thoracic (T12, T8, T5, T1) and sacrum (S1) spine Z-axis accelerations obtained from WSU whole-body PMHS tests. The scores for the updated spine model ranged from 0.557 - 0.756 for condition 1 (Seat- 4 m/s in 10 ms; Floor- 6 m/s in 5 ms) and 0.639-0.849 for condition 2 (Seat- 4 m/s in 55 ms; Floor- 8 m/s in 2 ms). The PMHS tests sustained spinal injuries in the thoracolumbar region. The validated model indicates high stress and strain concentrations at the same locations, providing an explanation for the fractures sustained in the PMHS tests.
在 2001 年至 2009 年期间对伊拉克自由行动（OIF）和持久自由行动（OEF）中的脊柱损伤进行的一项研究中，骑马士兵所受的脊柱骨折占所有损伤的 26%，其中 43%是由爆炸引起的[1]。胸腰椎是脊柱最脆弱的区域[2]，受伤通常会使人丧失能力，使车辆难以驶出。由于缺乏专门针对底部爆炸（UBB）和相关损伤标准的研究，因此此类事件的损伤预测仍然是一个挑战。本研究专注于使用经过仪器化的法医人体模型（PMHS）实验室测试，针对两种独特情况，开发和验证更新的第 50 百分位男性全球人体模型联盟（GHBMC）有限元（FE）模型的脊柱响应。该模型通过使用从 WSU 全身 PMHS 测试中获得的比例式胸椎（T12、T8、T5、T1）和骶骨（S1）脊柱 Z 轴加速度创建的响应通道进行了验证。更新后的脊柱模型的得分在条件 1（座椅-4 m/s 在 10 ms 内；地板-6 m/s 在 5 ms 内）的得分为 0.557-0.756，在条件 2（座椅-4 m/s 在 55 ms 内；地板-8 m/s 在 2 ms 内）的得分为 0.639-0.849。PMHS 测试在胸腰椎区域造成了脊柱损伤。经验证的模型表明在相同位置存在高应力和应变集中，这为 PMHS 测试中发生的骨折提供了一种解释。
