牛胸腰椎椎体切除后不同内植物的极限力学性能测试

The Ultimate Load and Displacement of Different Implants with a Bovin e Thoracic Lumbar Spinal Constructs Model

目的 :测试牛胸腰椎椎体切除后不同内植物重建后标本的极限力学性能。方法 :2 1具标本随机分为对照组、髂骨植骨组、人工椎体替代组、髂骨植骨 +前路钢板组、人工椎体 +前路钢板组、髂骨植骨 +椎弓根钉组及人工椎体 +椎弓根钉等 7组。测量各组的最大载荷及位移。结果 :正常小牛胸腰椎标本的极限载荷最高。髂骨植骨组的承载能力最差 ,仅有原始标本的 45 % ,单纯钛合金人工椎体组平均破坏载荷比髂骨植骨组高 1 6 % ,附加前路钢板及后路椎弓根钉固定 ,破坏载荷均高于单纯植入者。结论 :不管是人工椎体还是髂骨替代其极限载荷及极限位移均小于原始标本 。

Objective:To investigate the ultimate load and displacement of different implants with a bovine thoracic lumbar spinal corpectomy construct model. Methods:Twenty -one bovine thoracic lumbar spine specimens were randomly divided into seven groups which we re control group,iliac group,AHT-AVB group,iliac with supplemented anterior pla te group, AVB with supplemented anterior plate group,iliac with supplemented posterior pe dicle screw group and AVB with supplemented posterior pedicle screw group.The ultimate load and displacement of axial compression were tested respectively.Results:The ultimat e load and displacement of the intact specimen is the highest while the iliac group is lowe st.After supplemented with anterior plate or posterior pedicel screw the ultimate load an d displacement value increased.Conclusions:Both the iliac and AVB group has the lower ultimate load and displacement compare with the intact group even with add itional interfixation.But the AVB group is higher than the iliac group.