Characteristics of Dynamic Cervical Vertebral Kinematics for Female and Male Volunteers in Low-speed Rear Impact, based on Quasi-static Neck Kinematics
Characteristics of Dynamic Cervical Vertebral Kinematics for Female and Male Volunteers in Low-speed Rear Impact, based on Quasi-static Neck Kinematics
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发表时间：
2015
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通讯作者：
Fusako Sato;Taichi Nakajima;K. Ono;M. Svensson;K. Kaneoka
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作者：
Fusako Sato;Taichi Nakajima;K. Ono;M. Svensson;K. Kaneoka
本研究的目的是通过比较准静态的肌肉诱导颈椎运动学，来明确女性和男性志愿者在低速后部碰撞条件下惯性诱导颈椎运动学的动态特征。使用了两个系列的志愿者测试。其中一个是来自2个女性和4个男性的后部碰撞雪橇测试系列的数据。第二组数据来自对4名女性和9名男性的自愿弯颈测试。颈椎活动度由放射成像系统测量。第一个测试系列中的相同志愿者也参加了第二个测试系列。女性C4/C5至C6/C7峰型伸展角度大于最大主动后缩角。相比之下，男性S峰型的自愿性退缩幅度最大。S峰形的C6/C7向后位移超过了女性的最大自愿伸长值。C5/C6椎体角位移在峰值伸展时最大，并超过自愿伸展，女性尤为明显。C5/C6和C6/C7椎体X向归一化位移峰值伸展时的后方位移大于自愿伸展时的后方位移，且超过了男性和女性的最大自愿伸长。
The purpose of this study is to clarify the dynamic characteristics of inertia‐induced cervical vertebral kinematics for both female and male volunteers in low‐speed rear impact conditions by comparing quasi‐static muscle‐induced neck kinematics. Two series of volunteer tests were used. One is data from a rear impact sled test series with 2 females and 4 males. The second set of data is from a voluntary neck bending test series with 4 females and 9 males. Cervical vertebral motions were measured by a cineradiography system. The same volunteers in the first test series also participated in the second test series. C4/C5 through C6/C7 showed larger extension angle in the peak S shape than maximum voluntary retraction for females. In contrast, the peak S shape was in the maximum voluntary retraction for males. The rearward displacements at C6/C7 in the peak S shape exceeded the maximum voluntary extension for females. The vertebral angular displacement at C5/C6 was greatest in the peak extension and exceeded the voluntary extension, especially for females. The vertebral normalised displacements in X‐direction at C5/C6 and C6/C7 showed larger rearward displacements in the peak extension than the voluntary extension, and exceeded the maximum voluntary extension for both genders.