摘要
目的:研究采用腰椎动态固定系统行PLIF术的术后即刻稳定性,为临床应用提供生物力学依据。方法:采用10具新鲜小牛脊柱标本,分别于正常完整状态、L5S1滑脱的腰椎失稳模型、L5S1滑脱使用动态固定系统行PLIF内固定下测试各组的生物力学特性。结果:经采用动态固定系统行PLIF内固定后,在轴向压缩、前屈、后伸、侧弯工况下,内固定组的平均轴向刚度、水平剪切刚度、扭转强度和扭转刚度都较正常组和滑脱组增加。其数值和正常组间无明显差异(P>0.05),与滑脱组数值间具有明显差异(P<0.05)。结论:采用动态固定系统行PLIF内固定后,在轴向压缩、前屈、后伸、侧弯工况下,腰椎的轴向刚度、水平剪切刚度、扭转强度和扭转刚度较滑脱时明显提高,能够达到或超过腰椎生理正常状态,满足对手术固定后即刻稳定性的需要。
Objective:To evaluate the biomechanical stability of PLIF with dynamic fixation,and to provide a biomechnical basis for clinical application.Methods:Ten bovine lumbers act as three groups(A-group:intact,B-group:spondylolisthesis,C-group:PLIF with dynamic fixation).Nondestructive tests were performed in pure compression,flexion,extension,and lateral bending on every group.Results:Compared with group A and B,after the fixation,the mean straining of vertebral body in group C increased.The value of group C had significant difference from group B(P<0.05).And the value of group C was proximal to group A(P>0.05).Conclusion:After PLIF operation with dynamic fixation,the stiffness of vertebral body is approached the intact group during axis compression,flexion,extension and lateral bending.And the initial stability is enough after operation.
出处
《南通大学学报（医学版）》
2008年第5期339-341,共3页
Journal of Nantong University(Medical sciences)
关键词
腰椎
椎间融合术
动态固定
生物力学
Lumber spine
Interbody fusion
Dynamic fixation
Biomechanics
