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Lower Extremity Injury Criteria for Evaluating Military Vehicle Occupant Injury in Underbelly Blast Events

机译：用于评估军用车辆乘员损伤的下肢损伤标准

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Anti-vehicular (AV) landmines and improvised explosive devices (IED) have accounted for more than half of the United States military hostile casualties and wounded in Operation Iraqi Freedom (OIF) (Department of Defense Personnel & Procurement Statistics, 2009). The lower extremity is the predominantly injured body region following an AV mine or IED blast accounting for 26 percent of all combat injuries in OIF (Owens et al., 2007). Detonations occurring under the vehicle transmit high amplitude and short duration axial loads onto the foot-ankle-tibia region of the occupant causing injuries to the lower leg. The current effort was initiated to develop lower extremity injury criteria for occupants involved in underbelly blast impacts. Eighteen lower extremity post mortem human specimens (PMHS) were instrumented with an implantable load cell and strain gages and impacted at one of three incrementally severe AV axial loading conditions. Twelve of the 18 PMHS specimens sustained fractures of the calcaneus, talus, fibula and/or tibia. The initiation of skeletal injury was precisely detected by strain gages and corresponded with local peak axial tibia force. Survival analysis identified peak axial tibia force and impactor velocity as the two best predictors of incapacitating injury. A tibia axial force of 5,931 N and impactor velocity of 10.8 m/s corresponds with a 50 percent risk of an incapacitating injury. The criteria may be utilized to predict the probability of lower extremity incapacitating injury in underbelly blast impacts.
机译：防车（AV）地雷和简易爆炸装置（IED）占美国军事敌意的一半以上，在伊拉克自由（OIF）（OIF）（国防部人员和采购统计，2009年）中受伤。下肢是在AV矿山或IED爆炸占OIF中所有战斗损伤的26％后主要受伤的身体区域（Owens等，2007）。在车辆下发生的爆震将高幅度和短持续时间轴向载荷传输到乘员的脚踝胫骨区域上导致小腿损伤。目前的努力是为了开发患者患者遭受的患者的下肢损伤标准。 18个下肢后验验人类标本（PMHs）用植入式载荷电池和应变计进行仪表，并影响三种递增严重的AV轴向负载条件中的一种。 18个PMHS标本的12个PMHS标本持续骨折，缩略图，腓骨和/或胫骨。通过应变计精确地检测骨架损伤并与局部峰值轴向胫骨力相对应。生存分析确定了峰值胫骨力和撞击速度作为丧失伤害的两个最佳预测因子。胫骨轴向力​​为5,931 n和10.8 m / s的撞击力，对应于损伤损伤的50％。可以利用标准来预测腹部爆炸冲击损伤的下肢损伤的概率。

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