Yingling V R, McGill S M
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Ontario, Canada.
J Spinal Disord. 1999 Dec;12(6):501-8.
Few studies have focused on failure patterns of the entire motion segment and on the function of the individual structures resulting from dynamic posterior loading. The current study investigated the mechanical properties of the motion segment under posterior shear loading and documented the resulting injuries. Twenty-six porcine motion segments were separated into three groups (whole segments, no posterior ligaments, and no posterior ligaments and facet joints). The specimens were tested under posterior shear loading to failure in a custom-designed jig adapted to a testing machine. Load-deformation curves were collected to obtain the following parameters: the energy absorbed to failure, the deformation at failure, the ultimate shear load, and the stiffness. The disk was found to carry approximately 1,540 N (74% of the intact specimen) of the ultimate load. Stiffness was dominated by the intervertebral disk complex, accounting for approximately 85% of the average stiffness. The predominant injuries resulting from posterior shear loading were avulsions of the end plate.
很少有研究关注整个运动节段的失效模式以及动态后向加载导致的各个结构的功能。本研究调查了后向剪切加载下运动节段的力学性能，并记录了由此产生的损伤。将26个猪运动节段分为三组（完整节段、无后韧带节段以及无后韧带和小关节节段）。在适配于试验机的定制夹具中，对标本进行后向剪切加载直至失效测试。收集载荷-变形曲线以获得以下参数：失效时吸收的能量、失效时的变形、极限剪切载荷和刚度。发现椎间盘承受了大约1540 N（完整标本的74%）的极限载荷。刚度主要由椎间盘复合体决定，约占平均刚度的85%。后向剪切加载导致的主要损伤是终板撕脱。
