摘要
[目的]探讨采用内固定或椎体增强技术后邻近节段生物力学特性的变化。[方法]12具尸体胸腰椎标本,分为正常对照组、椎体压缩骨折后经椎弓根自体骨植骨组、椎体成形术组、RF内固定组分别进行实验应力分析。应力加载方式为轴向压缩、前屈、后伸、侧屈等4种,通过各种工况的生物力学测试,说明采用内固定或椎体增强技术后邻近节段力学特性的变化。[结果]采用椎体内植骨或骨水泥填充的方法,有使邻近节段的刚度降低,应力强度提高的轻微趋势,但无显著性差异(P>0.05)。而采用内固定后,邻近节段刚度明显降低,应力强度明显提高,呈显著性差异(P<0.05)。[结论]采用椎体内植骨或骨水泥填充的方法对邻近节段的影响较小,而采用内固定后对邻近节段产生了不利的生物力学影响。
[ Objective] To study the biomechanical effects on the adjacent segment of thoracolumbar spine with internal fixation or vertebral body enhancement. [ Method ] Twelve cadaver thoracolumbar spine specimens were randomly divided into 4 group： Normal contral; Thoracolumbar fractures with interbody fusion via transpedicular autogenacs bone grafting; Thoracolumbar fractures with transpedicular PMHA cement grafting; Thoracolumbar fractures with internal fixator. Four simulations （axial compression, flexion, extension and lateral bending） were applied in the biomechanical testing machine. Data of the rigidity and stress of the adjacent segment were recorded and analyzed. [ Result] Vertebral body enhancement could make a tiny tendency that the adjacent segment rigidity degrade and stress raise, but there was no significant difference （ P 〉 0.05 ）. Internal fixation could make the adjacent segment rigidity degrade and stress raise significanly（ P 〈0.05 ）. [ Conclusion] Vertebral body enhancement has little effect on the adjacent segment. Internal fixation has disadvantageous effect on the adjacent segment.
出处
《中国矫形外科杂志》
CAS
CSCD
北大核心
2007年第16期1238-1240,共3页
Orthopedic Journal of China
基金
江苏省社会发展指导性计划(No.BS2005635)
关键词
内固定
椎体增强技术
邻近节段
生物力学
internal fixation
vertebral body enhancement
adjacent segment
biomechanics
