R&D Center, Medyssey Co, Ltd, Jechon, Republic of Korea; Department of Biomedical Engineering, College of Biomedical Science& Engineering, Inje University, Gyeongnam, Republic of Korea; Department of Neurosurgery, CHA University, CHA Bundang Medical Center, Republic of Korea.
R&D Center, Medyssey Co, Ltd, Jechon, Republic of Korea.
J Clin Neurosci. 2019 Aug;66:246-250. doi: 10.1016/j.jocn.2019.04.036. Epub 2019 May 10.
We aim to investigate using finite element model (FEM) whether the use of a cross-link is a risk factor for rod fracture at the pedicle subtraction osteotomy (PSO) site.
The geometry and dimensions of the FEM were obtained from a high-resolution computed tomography scan data of a 65 years old female patient with spinal sagittal imbalance. The intact model was modified to place PSO on the L4 spine. A cross-link was placed at the PSO site. A multisegment spinal fusion model from L1 to the pelvis was used to compare and analyze the peak von Mises stress (PVMS) values of the implants. A compressive follower load of 400 N was added to the validated intact lumbar spinal model in the follower load path direction.
After PSO surgery, the PVMS of the rod was significantly increased during flexion and extension at the PSO site. With the cross-link at the PSO site, the PVMS of the rod was further significantly increased during flexion and extension.
The cross-link at the PSO site increased the risk of rod facture, especially during flexion and extension stress.
我们旨在通过有限元模型（FEM）研究使用交联是否是椎弓根减法截骨术（PSO）部位杆断裂的危险因素。
从一名患有脊柱矢状失平衡的 65 岁女性的高分辨率计算机断层扫描数据中获得 FEM 的几何形状和尺寸。对完整模型进行修改以在 L4 脊柱上进行 PSO。使用多节段脊柱融合模型从 L1 到骨盆，比较和分析植入物的峰值 von Mises 应力（PVMS）值。在跟随负载路径方向上将 400N 的压缩跟随负载施加到经过验证的完整腰椎脊柱模型上。
PSO 手术后，在 PSO 部位的屈伸过程中，杆的 PVMS 显著增加。在 PSO 部位使用交联后，杆在屈伸过程中的 PVMS 进一步显著增加。
PSO 部位的交联增加了杆断裂的风险，尤其是在屈伸应力下。
