Department of Orthopaedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, China.
Biomed Res Int. 2021 Apr 10;2021:8872514. doi: 10.1155/2021/8872514. eCollection 2021.
In this study, the mechanical properties of the new spinal fixation system (NSFS) in the treatment of thoracolumbar fractures were evaluated by the finite element analysis method, so as to provide a mechanical theoretical basis for the later biomechanical experiments and clinical experiments.
T12-L2 bone model was constructed to simulate L1 vertebral fracture, and three models of internal fixation systems were established on the basis of universal spinal system (USS): Model A: posterior short-segment fixation including the fractured vertebra (PSFFV); Model B: short-segment pedicle screw fixation (SSPF); Model C: new spinal fixation system (NSFS). After assembling the internal fixation system and fracture model, the finite element analysis was carried out in the ANSYS Workbench 18.0 software, and the stress of nail rod system, fracture vertebral body stress, vertebral body mobility, and vertebral body displacement were recorded in the three models.
The peak values of internal fixation stress, vertebral body stress, vertebral body maximum displacement, and vertebral body maximum activity in Model C were slightly smaller than those in Model B.
Compared with the traditional internal fixation system, the new spinal internal fixation system may have the mechanical advantage and can provide sufficient mechanical stability for thoracolumbar fractures.
本研究通过有限元分析方法评估新型脊柱固定系统（NSFS）治疗胸腰椎骨折的力学性能，为后期的生物力学实验和临床实验提供力学理论基础。
构建 T12-L2 骨模型以模拟 L1 椎体骨折，在通用脊柱系统（USS）的基础上建立三种内固定系统模型：A 型：包含骨折椎体的后路短节段固定（PSFFV）；B 型：短节段椎弓根螺钉固定（SSPF）；C 型：新型脊柱固定系统（NSFS）。组装内固定系统和骨折模型后，在 ANSYS Workbench 18.0 软件中进行有限元分析，记录三种模型中钉棒系统的应力、骨折椎体的应力、椎体活动度和椎体位移。
C 型模型中内固定应力、椎体应力、椎体最大位移和椎体最大活动度的峰值稍小于 B 型模型。
与传统内固定系统相比，新型脊柱内固定系统可能具有力学优势，可为胸腰椎骨折提供足够的力学稳定性。
