Liang Tao, Lin Hao, Feng Ganjun, Huang Haifeng, Zhao Xianfeng
Department of Orthopaedics, West China Hospital of Sichuan University, Chengdu 610041, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2011 Jun;28(3):491-6.
This paper is aimed to evaluate the biomechanism of monosegmental and bisegmental anterior fixation for thoracolumbar burst fracture. Twenty-four fresh porcine spines (T13-L3) were used in this study. Three of the fresh porcine spines were randomly selected as intact group, and the others were made into L1 burst fracture models. Fifteen of the twenty one fracture models fitting to the experimental requirements were divided randomly into five groups. Each of the specimens in the five groups and in the intact group underwent the tests of load-strain, load-displacement, stiffness and extreme limit bisegmental fixation group (P<0.05) loading. Data for the monosegmental fixation were insignificantly different on the load- strain and load-displacement tests from those for the bisegmental fixation (P>0.05), but were significantly different from those of the bisegmental fixation on the stiffness test, torsion test and limit loading test. Anterior monosegmental fixation is more stable and has stronger strain of axial compression than the bisemental fixation group. Resect pedicle group is insignificantly different from the monosegmental fixation group,so it is important to keep the pedicle integrity of injured vertebral body in surgery. The biomechanical stability of monosegmental fixation is feasible for thoracolumbar burst fracture.
本文旨在评估胸腰椎爆裂骨折单节段和双节段前路固定的生物力学机制。本研究使用了24个新鲜猪脊柱（T13-L3）。随机选取3个新鲜猪脊柱作为完整组，其余制成L1爆裂骨折模型。符合实验要求的21个骨折模型中的15个被随机分为5组。五组和完整组中的每个标本都进行了载荷-应变、载荷-位移、刚度和极限载荷双节段固定组（P<0.05）加载测试。单节段固定在载荷-应变和载荷-位移测试中的数据与双节段固定的数据无显著差异（P>0.05），但在刚度测试、扭转测试和极限载荷测试中与双节段固定的数据有显著差异。前路单节段固定比双节段固定组更稳定，轴向压缩应变更强。切除椎弓根组与单节段固定组无显著差异，因此在手术中保持受伤椎体椎弓根的完整性很重要。单节段固定的生物力学稳定性对于胸腰椎爆裂骨折是可行的。
