Yoganandan N, Pintar F, Butler J, Reinartz J, Sances A, Larson S J
Department of Neurosurgery, Medical College of Wisconsin, Milwaukee.
Spine (Phila Pa 1976). 1989 Oct;14(10):1102-10. doi: 10.1097/00007632-198910000-00013.
This study was undertaken to investigate the dynamic response of human cervical spine ligaments. Uniaxial tensile failure tests were conducted on anterior longitudinal ligament (AL) and ligamentum flavum (LF) structures. These ligaments were tested under in situ conditions by transecting all the elements except the one (AL or LF) under study. A fixture was designed to properly align the specimen to induce a uniaxial mode of loading. A six-axis load cell was placed at the distal end of the specimen. The proximal end of the specimen was attached to the piston of a specially designed electrohydraulic testing device. The biomechanical properties of the ligaments were determined at four different loading rates of 8.89, 25.0, 250.0 and 2500 mm/sec. The mechanical response indicated nonlinear and sigmoidal characteristics. The ultimate tensile failure load, stiffness, and energy-absorbing capacity at failure were found to increase with increasing loading rates for both the AL and LF. However, the distractions at failure did not indicate this tendency. While the ultimate tensile force and ultimate energy-absorbing capacity varied nonlinearly with the logarithm of the loading rate, the stiffness varied linearly.
本研究旨在探究人颈椎韧带的动态响应。对前纵韧带（AL）和黄韧带（LF）结构进行了单轴拉伸破坏试验。通过横断除所研究的韧带（AL或LF）之外的所有结构，在原位条件下对这些韧带进行测试。设计了一种夹具，以正确对齐标本，从而诱导单轴加载模式。在标本的远端放置了一个六轴力传感器。标本的近端连接到专门设计的电动液压测试装置的活塞上。在8.89、25.0、250.0和2500毫米/秒这四种不同加载速率下测定韧带的生物力学特性。力学响应呈现出非线性和S形特征。发现对于AL和LF而言，极限拉伸破坏载荷、刚度以及破坏时的能量吸收能力均随加载速率的增加而增加。然而，破坏时的伸长并未显示出这种趋势。虽然极限拉伸力和极限能量吸收能力随加载速率的对数呈非线性变化，但刚度呈线性变化。
