不同骨密度轨迹内固定系统对腰椎L4-L5节段的影响

为了评价改良皮质骨螺钉技术(modified cortical screw technique,MCBT)与其他传统内固定系统对腰椎骨质疏松湿标本L4-L5节段的生物力学影响.通过运用计算机体层摄影(computed tomography,CT)数据建立4种不同的有限元模型,比较三种置钉模型在相同生理负荷下的内固定系统...

Effects of different bone mineral density trajectories internal fixation system on L4-L5 segments of lumbar spine

In order to evaluate the biomechanical effects of modified cortical screw technique (MCBT) and other traditional internal fixation systems on L4-L5 segments of lumbar osteoporosis wet specimens. Four different finite element models were established by using CT data to compare the stress changes of internal fixation system and the changes of lumbar L4-L5 segment activity under the same physiological load. The results showed that the maximum stress of the internal fixation system in the modified model group was significantly higher than that of traditional pedicle screw technology (TT) and traditional cortical screw technology (CBT) under the condition of forward flexion, extension, lateral bending and torsion. The minimum degree of activity of MCBT screw model was in the forward flexion, extension and torsion condition, and the lateral bending condition was larger than TT model group and CBT model group. Compared with TT and CBT, MCBT has better mechanical stability and has certain value in clinical application.