Biomechanical Comparison between Isobar and Dynamic-Transitional Optima (DTO) Hybrid Lumbar Fixators: A Lumbosacral Finite Element and Intersegmental Motion Analysis.
Biomechanical Comparison between Isobar and Dynamic-Transitional Optima (DTO) Hybrid Lumbar Fixators: A Lumbosacral Finite Element and Intersegmental Motion Analysis.
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DOI：
10.1155/2022/8273853
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发表时间：
2022
影响因子：
--
通讯作者：
Zhong, Zheng-Cheng
中科院分区：
文献类型：
--
作者：
Chen, Shih-Hao;Hsiao, Chih-Kun;Wang, Chih-Wei;Chen, Hsiang-Ho;Zhong, Zheng-Cheng
评价动态混合装置中纵向部件的生物力学性能，以显示Dynesys脊髓间隔器或Isobar阻尼器-关节动态稳定器对基于各种椎间盘退变的连接问题的载荷传递效果。动态组件适用于轻度退行性L3-L4节段，静态组件在位移控制模式下固定于中度退行性L4-L5节段，用于有限元研究。在此基础上，对合成模型在载荷控制模式下的节段间运动行为进行了实验分析。Isobar或DTO混合固定器可减少过渡节段的应力/运动，但对头侧相邻节段的补偿作用大于尾侧。在权衡区域内（作为过渡段和相邻节段之间的运动保持平衡），通过柔性Dynesys软线，主要在屈曲时减少了刚度相关问题。相比之下，Isobar阻尼器提供了最大允许位移（大于峰值轴向刚度）的效果，以减少椎弓根内和小关节处的应力。过渡节段的椎弓根螺钉行程与Isobar阻尼器关节（大于Dynesys脊髓间隔器）的椎间盘退变程度相关，这归因于运动时轴向位移和角旋转的设计效应。在与临床使用相关的生物力学特性方面，动力混合型腰椎固定器的纵向索/阻尼器应设计成在螺钉-椎体连接处和小关节处产生较小的界面应力，以减少椎弓根螺钉在各种椎间盘退变下的松动/断裂。
Biomechanical performance of longitudinal component in dynamic hybrid devices was evaluated to display the load-transfer effects of Dynesys cord spacer or Isobar damper-joint dynamic stabilizer on junctional problem based on various disc degenerations. The dynamic component was adapted at the mildly degenerative L3–L4 segment, and the static component was fixed at the moderately degenerative L4–L5 segment under a displacement-controlled mode for the finite element study. Furthermore, an intersegmental motion behavior was analyzed experimentally on the synthetic model under a load-controlled mode. Isobar or DTO hybrid fixator could reduce stress/motion at transition segment, but compensation was affected at the cephalic adjacent segment more than the caudal one. Within the trade-off region (as a motion-preserving balance between the transition and adjacent segments), the stiffness-related problem was reduced mostly in flexion by a flexible Dynesys cord. In contrast, Isobar damper afforded the effect of maximal allowable displacement (more than peak axial stiffness) to reduce stress within the pedicle and at facet joint. Pedicle-screw travel at transition level was related to the extent of disc degeneration in Isobar damper-joint (more than Dynesys cord spacer) attributing to the design effect of axial displacement and angular rotation under motion. In biomechanical characteristics relevant to clinical use, longitudinal cord/damper of dynamic hybrid lumbar fixators should be designed with less interface stress occurring at the screw-vertebral junction and facet joint to decrease pedicle screw loosening/breakage under various disc degenerations.
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影响因子：
2.4
作者：
Ruberte, Lissette M.;Natarajan, Raghu N.;Andersson, Gunnar B. J.
通讯作者：
Andersson, Gunnar B. J.
DOI：
10.1016/sasj-2008-0010-lr
发表时间：
2008-01-01
期刊：
SAS journal
影响因子：
--
作者：
Barrey, Cedric Y;Ponnappan, Ravi K;Vaccaro, Alexander R
通讯作者：
Vaccaro, Alexander R
影响因子：
2.4
作者：
Kim, Kyungsoo;Kim, Yoon Hyuk;Lee, SuKyoung
通讯作者：
Lee, SuKyoung
影响因子：
2.8
作者：
La Barbera, Luigi;Galbusera, Fabio;Villa, Tomaso
通讯作者：
Villa, Tomaso
DOI：
10.1016/j.esas.2011.01.003
发表时间：
2011
期刊：
SAS journal
影响因子：
--
作者：
Hudson WR;Gee JE;Billys JB;Castellvi AE
通讯作者：
Castellvi AE