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首页> 外文期刊>Journal of Biomechanics >Dynamic dorsoventral stiffness assessment of the ovine lumbar spine
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Dynamic dorsoventral stiffness assessment of the ovine lumbar spine

机译：腰椎动态背腹僵硬度评估

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摘要

Posteroanterior spinal stiffness assessments are common in the evaluating patients with low back pain. The purpose of this study was to determine the effects of mechanical excitation frequency on dynamic lumbar spine stiffness. A computer-controlled voice coil actuator equipped with a load cell and LVDT was used to deliver an oscillatory dorsoventral (DV) mechanical force to the L3 spinous process of 15 adolescent Merino sheep. DV forces (48N peak, similar to 10% body weight) were randomly applied at periodic excitation frequencies of 2.0, 6.0, 11.7 and a 0.5-19.7 Hz sweep. Force and displacement were recorded over a 13-22 s time interval. The in vivo DV stiffness of the ovine spine was frequency dependent and varied 3.7-fold over the 0.5-19.7 Hz mechanical excitation frequency range. Minimum and maximum DV stiffness (force/displacement) were 3.86 +/- 0.38 and 14.1 +/- 9.95 N/mm at 4.0 and 19.7 Hz, respectively. Stiffness values based on the swept-sine measurements were not significantly different from corresponding periodic oscillations (2.0 and 6.0 Hz). The mean coefficient of variation in the swept-sine DV dynamic stiffness assessment method was 15%. which was similar to the periodic oscillation method (10-16%). The results indicate that changes in mechanical excitation frequency and animal body mass modulate DV spinal stiffness. (c) 2005 Elsevier Ltd. All rights reserved.
机译：后腰椎僵硬性评估常用于评估腰痛患者。这项研究的目的是确定机械激发频率对动态腰椎刚度的影响。装有测力传感器和LVDT的计算机控制音圈致动器用于向15头美利奴羊的L3棘突传递摆动的腹背（DV）机械力。以2.0、6.0、11.7和0.5-19.7 Hz的周期性激励频率随机施加DV力（峰值为48N，类似于体重的10％）。在13-22 s的时间间隔内记录力和位移。绵羊脊柱的体内DV刚度是频率依赖性的，并且在0.5-19.7 Hz机械激发频率范围内变化3.7倍。 DV的最小和最大刚度（力/位移）在4.0和19.7 Hz时分别为3.86 +/- 0.38和14.1 +/- 9.95 N / mm。基于扫频正弦测量的刚度值与相应的周期性振荡（2.0和6.0 Hz）没有显着差异。后掠正弦DV动态刚度评估方法的平均变异系数为15％。这类似于周期振荡法（10-16％）。结果表明，机械激发频率和动物体重的变化可调节DV脊柱的僵硬度。 （c）2005 Elsevier Ltd.保留所有权利。

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