模拟腰椎后路间盘摘除植骨与置融合器术T_(12)-S_1腰段脊柱粘弹性实验研究

Experimental Study on Viscoelasticity of Spinal Lumbar Vertebrae (T_(12)-S_1) by Simulating the Operation of Excising Intervertebral Disc and Planting Bone on Back Route and the Operation of Excising Intervertebral Disc and Inserting Fusion Cage

根据国人腰椎的特点 ,设计研制了一种纯钛腰椎置入融合器 ,并进行生物力学测试 ,方法是取 18具新鲜成年男性 T1 2 - S1 腰椎标本 ,测定完整腰椎 (正常组 )模拟后路间盘摘除植骨组 (对照 1组 )和模拟后路间盘摘除置入融合器组 (对照 2组 ) T1 2 - S1 段腰椎的应力松弛和蠕变——时间曲线及数据。用回归分析的方法处理实验数据 ,得出了归一化应力松弛函数、蠕变函数及曲线 ,对后路间盘摘除植骨与置入纯钛融合器对脊柱稳定性的影响进行分析讨论。

According to the physiological characteristics of lumbar vertebrae in Chinese, we designed and made a lumbar vertebral fusion cage of titanium and then engaged in its biomechanical test. T12-S1 of lumbar vertebrae from 18 fresh dead bodies were used. We measured the stress relaxation and the creep effects of the normal group (T12-S1 of intact lumbar vertebrae), the control group 1 (simulating operation of excising intervertebral disc and planting bone on the back route) and the control group 2 (simulating operation of excising intervertebral disc and inserting fusion cage). The data and stress, strain-time curves under the condition of constant stress and strain were obtained. Regression analysis yielded the reduced stress relaxation and creep functions. Finally, we analyzed and discussed the effects of the operation of excising intervertebral disc and planting bone on the back route and the operation of excising intervertebral disc and inserting fusion cage on the stability of spine.