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首页> 外文期刊>Journal of Biomechanics >Mechanical properties of spinal different nerve roots subjected to tension at strain rates
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Mechanical properties of spinal different nerve roots subjected to tension at strain rates

机译：应变速率下承受张力的脊髓不同神经根的力学特性

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摘要

An understanding of the biomechanical and physiological properties of spinal nerve roots, particularly in response to tension, is critical in understanding the pathomechanisms of pain and nerve root injury and subsequent management of related injuries. Biomechanical properties of dorsal nerve roots at the lumbar and sacral levels were evaluated at various strain rates. Nerve roots were stretched at two different rates, 0.01 mm/s (Group A, quasistatic) and 15 mm/s (Group B, dynamic). Load, displacement and digital video data were obtained as the nerve roots were stretched until failure. Maximum stress, strain at maximum stress and modulus of elasticity (E) were calculated from the load-displacement measurements. Comparison of mechanical properties and failure patterns of nerve roots at two different rates revealed significant differences. Maximum load, maximum stress and E values of 5.7 +/- 2.7 gm, 257.9 +/- 111.3 kPa and 1.3 +/- 0.8 MPa were observed for Group A and 13.9 +/- 7.5 gm, 624.9 +/- 306.8 kPa and 2.9 +/- 1.5 MPa were observed for Group B, respectively. Higher maximum load, maximum stress and E values occurred at the dynamic stretch rate as compared to the quasistatic stretch rate, illustrating the strain-rate dependency of spinal nerve roots. No differences were observed in the strain values. Differences in mechanical behavior of nerve roots were also observed among the four root levels (L4-S1). A significant interaction effect was observed between nerve root diameter and stretch rates. Overall, results from the present study demonstrate viscoelastic material properties of spinal nerve roots and provide better insight on the tensile properties of nerve roots at different strain rates. (c) 2005 Elsevier Ltd. All rights reserved.
机译：了解脊神经根的生物力学和生理特性，特别是对张力的响应，对于理解疼痛和神经根损伤的发病机理以及随后的相关损伤的处理至关重要。在各种应变率下评估了腰椎和nerve骨水平的背神经根的生物力学特性。神经根以两种不同的速率拉伸：0.01 mm / s（A组，准静态）和15 mm / s（B组，动态）。拉伸神经根直至衰竭，获得负荷，位移和数字视频数据。从负荷-位移测量值计算出最大应力，最大应力下的应变和弹性模量（E）。以两种不同的速率比较神经根的力学性质和破坏模式显示出显着差异。 A组和13.9 +/- 7.5 gm，624.9 +/- 306.8 kPa和2.9组的最大载荷，最大应力和E值分别为5.7 +/- 2.7 gm，257.9 +/- 111.3 kPa和1.3 +/- 0.8 MPa B组分别观察到+/- 1.5 MPa。与准静态拉伸速率相比，在动态拉伸速率下出现了更高的最大载荷，最大应力和E值，说明了脊神经根的应变速率依赖性。在应变值上没有观察到差异。在四个根水平（L4-S1）之间也观察到了神经根机械行为的差异。在神经根直径和伸展率之间观察到显着的相互作用。总的来说，本研究的结果证明了脊神经根的粘弹性材料特性，并提供了不同应变速率下神经根的拉伸特性的更好的见解。 （c）2005 Elsevier Ltd.保留所有权利。

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