Clinical studies have extensively shown that burst fractures can cause severe and long-term neurological deficits. However, the mechanism of burst fracture is not clear, and the influence of different spinal postures on burst fracture is still unidentified. The study aimed at investigating the influence of different postures under vertical impact load on thoracolumbar burst fracture. A detailed nonlinear finite element model of T12-L2 segment was developed to investigate these problems. In this work, a rigid ball was used to vertically impact the finite element spinal segment, which emulated the process of burst fracture as in experimental condition. During the process, amounting to 9 different postures (normal, flexion, extension, right/left lateral bending of 8°, right/left axial rotation of 4° and 8°) were studied. Totally five failure modes were observed. Six different parameters, including vertebral height, vertebral bulge, interpedicular widening, vertebral kyphotic angle, posterior vertebral body angle, and joint facet contact force, were observed to evaluate the corresponding severity of burst fracture. Burst fracture in extension was the severest, and the loss of vertebral height in flexion was the most. The different postures in these simulations changed the morphology of intervertebral disc and facet joints force, resulting in different types of fracture.

临床研究广泛表明，爆裂性骨折可导致严重和长期的神经功能缺损。然而，爆裂性骨折的发生机制尚不明确，不同脊柱姿势对爆裂性骨折的影响尚不清楚。本研究旨在探讨垂直冲击载荷下不同姿势对胸腰椎爆裂性骨折的影响。开发了 T12-L2 段的详细非线性有限元模型来研究这些问题。在这项工作中，使用刚性球垂直撞击有限元脊柱节段，模拟了实验条件下的爆裂过程。在此过程中，共研究了9种不同的姿势（正常、屈曲、伸展、右/左侧弯8°、右/左轴向旋转4°和8°）。共观察到五种故障模式。观察椎体高度、椎体凸出度、椎弓根间增宽、椎体后凸角、椎体后角和关节面接触力等6个不同参数来评价相应的爆裂性骨折严重程度。伸展时爆裂骨折最为严重，屈曲时椎体高度损失最大。这些模拟中的不同姿势改变了椎间盘和小关节受力的形态，导致了不同类型的骨折。伸展时爆裂骨折最为严重，屈曲时椎体高度损失最大。这些模拟中的不同姿势改变了椎间盘和小关节受力的形态，导致了不同类型的骨折。伸展时爆裂骨折最为严重，屈曲时椎体高度损失最大。这些模拟中的不同姿势改变了椎间盘和小关节受力的形态，导致了不同类型的骨折。