Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Qiaoxi District, Shijiazhuang 050051, China.
Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, Hebei, China.
Biomed Res Int. 2021 Oct 11;2021:2949419. doi: 10.1155/2021/2949419. eCollection 2021.
The finite element analysis method was used to explore the biomechanical stability of a novel locking plate for thoracolumbar burst fracture fusion fixation.
The thoracolumbar CT imaging data from a normal volunteer was imported into finite software to build a normal model and three different simulated surgical models (the traditional double-segment fixation model A, the novel double-segment fixation model B, and the novel single-segment fixation model C). An axial pressure (500 N) and a torque (10 Nm) were exerted on the end plate of T12 to simulate activity of the spine. We recorded the range of motion (ROM) and the maximum stress value of the simulated cages and internal fixations.
Model A has a larger ROM in all directions than model B (flexion 5.63%, extension 38.21%, left rotation 46.51%, right rotation 39.76%, left bending 9.45%, and right bending 11.45%). Model C also has a larger ROM in all directions than model B (flexion 555.63%, extension 51.42%, left rotation 56.98%, right rotation 55.42%, left bending 65.67%, and right bending 59.47%). The maximum stress of the cage in model A is smaller than that in model B except for the extension direction (flexion 96.81%, left rotation 175.96%, right rotation 265.73%, left bending 73.73%, and right bending 171.28%). The maximum stress value of the internal fixation in model A is greater than that in model B when models move in flexion (20.23%), extension (117.43%), and left rotation (21.34%).
The novel locking plate has a smaller structure and better performance in biomechanical stability, which may be more compatible with minimally invasive spinal tubular technology.
采用有限元分析法探讨一种新型胸腰椎爆裂骨折融合固定锁定钢板的生物力学稳定性。
将一名正常志愿者的胸腰椎 CT 影像学数据导入有限元软件，建立正常模型和三种不同模拟手术模型（传统双节段固定模型 A、新型双节段固定模型 B 和新型单节段固定模型 C）。在 T12 终板上施加轴向压力（500N）和扭矩（10Nm），模拟脊柱活动。记录模拟笼和内固定的活动范围（ROM）和最大应力值。
模型 A 在各个方向上的 ROM 均大于模型 B（屈伸 5.63%，伸展 38.21%，左旋 46.51%，右旋 39.76%，左弯 9.45%，右弯 11.45%）。模型 C 在各个方向上的 ROM 也均大于模型 B（屈伸 555.63%，伸展 51.42%，左旋 56.98%，右旋 55.42%，左弯 65.67%，右弯 59.47%）。模型 A 中笼的最大应力除了伸展方向外均小于模型 B（屈伸 96.81%，左旋 175.96%，右旋 265.73%，左弯 73.73%，右弯 171.28%）。当模型在屈伸（20.23%）、伸展（117.43%）和左旋（21.34%）时，模型 A 中内固定的最大应力值大于模型 B。
新型锁定钢板具有更小的结构和更好的生物力学稳定性，可能更符合微创脊柱管状技术。
