A reanalysis of football impact reconstructions for head kinematics and finite element modeling
A reanalysis of football impact reconstructions for head kinematics and finite element modeling
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DOI：
10.1016/j.clinbiomech.2018.02.019
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发表时间：
2019-04-01
影响因子：
1.8
通讯作者：
Panzer, Matthew B.
中科院分区：
文献类型：
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作者：
Sanchez, Erin J.;Gabler, Lee F.;Panzer, Matthew B.
背景资料：由实验室重建的专业橄榄球头盔的影响所产生的头部运动学已被应用到计算模型，以研究脑震荡的生物力学。自从最初公布这一数据以来，已经开发了评估加速度计一致性和误差校正的技术。本研究应用这些技术的原始重建数据和重新分析的结果，给出了当前状态的震荡biomechanics.Methods：一致性检查应用于收集在每个测试假人的头部的传感器数据。使用分析技术校正不一致的数据，并根据校正后的数据重新计算头部运动学。对重建视频进行了审查，以确定重建期间的人为影响，从而确定模拟的适用范围。校正头部运动学输入到有限元大脑models调查应变响应校正dataset.Findings：多个重建的情况下有不一致的传感器阵列引起的问题传感器;校正阵列计算的旋转头部运动的变化。这些校正将脑震荡病例的中值峰值角速度从35.6 rad/s增加到41.5 rad/s。使用原始运动学导致每种情况下最大主应变结果的平均误差为20%。重建的模拟也表明，模拟长度小于40毫秒没有捕捉到整个大脑应变响应和预测不足strain.Interpretation本研究纠正了用于确定脑震荡风险的数据，并表明改变头部角运动和大脑应变响应许多重建。基于原始数据得出的结论应根据这项新研究重新审查。
Background: Head kinematics generated by laboratory reconstructions of professional football helmet impacts have been applied to computational models to study the biomechanics of concussion. Since the original publication of this data, techniques for evaluating accelerometer consistency and error correction have been developed. This study applies these techniques to the original reconstruction data and reanalyzes the results given the current state of concussion biomechanics.Methods: Consistency checks were applied to the sensor data collected in the head of each test dummy. Inconsistent data were corrected using analytical techniques, and head kinematics were recalculated from the corrected data. Reconstruction videos were reviewed to identify artefactual impacts during the reconstruction to establish the region of applicability for simulations. Corrected head kinematics were input into finite element brain models to investigate strain response to the corrected dataset.Findings: Multiple reconstruction cases had inconsistent sensor arrays caused by a problematic sensor; corrections to the arrays caused changes in calculated rotational head motion. These corrections increased median peak angular velocity for the concussion cases from 35.6 to 41.5 rad/s. Using the original kinematics resulted in an average error of 20% in maximum principal strain results for each case. Simulations of the reconstructions also demonstrated that simulation lengths less than 40 ms did not capture the entire brain strain response and under-predicted strain.Interpretation This study corrects data that were used to determine concussion risk, and indicates altered head angular motion and brain strain response for many reconstructions. Conclusions based on the original data should be re-examined based on this new study.