通用脊柱椎弓根钉棒矫形固定系统治疗胸腰椎失稳性伤病的生物力学测试

Biomechanical test of the general spinal pedicle screw-rod orthopaedics fixation system in the treatment of diseases related to spinal instability

目的:评价通用脊柱椎弓根钉棒矫形固定系统(GSPS)治疗脊柱失稳性伤病的生物力学性能。方法:用新鲜猪胸腰段脊柱标本(T10-L3)制成失稳模型和骨折模型各4具,分别用自行研制的GSPS模拟手术固定。对试件进行轴向和弯曲扭转加载测试,观察GSPS的应力、应变关系特点。测试GSPS连接棒从弹性夹块中的拔出力。结果:在0～600N轴向加载范围内,GSPS各点应变与应力呈线性关系;弯曲扭转实验中,试件两端之间相对扭转角与弯扭矩呈线性关系,当弯扭矩达到300N.cm时,扭转角不到6°;GSPS的连接棒从弹性夹块中拔出的最小拔出力大于3300N。结论:GSPS具有较高的抗轴向和弯扭载荷的能力,显示出高弹性。采用弹簧垫连接钉棒具有很高的可靠性。

Objective：To evaluate the biomechanical performance of the spinal universal fixation system（GSPS） in treating the diseases related to spinal instability. Methods：Four instable models and 4 fracture models were made of fresh pig＇s thoracolumbar specimens（T10-L3）. Self-designed GSPS were used in the simulated operation. Axial loading test and torsion test were made. The stress-strain relation of the GSPS was observed. The extracting force of link bar from elastic jig was tested. Results：The strain value of each tested point changed linearly when the axial load changed from 0 to 600 N. There was linear relation between the torsion and the torsion angle. The latter was less than 6°when the former reached 300 N·cm. The minimum extracting force of the link bar from the elastic jig was more than 3 300 N. Conclusion：The GSPS has high energy and high elasticity on anti-axial and antitorsion load. It is stable to use elastic link bar.