OBJECTIVE To simulate the process of curve correction with different strategies of pedicle screws placement, and then explore the ideal strategy. Materials and methods: A three-dimensional model was constructed using CT data from a Lenke 1 AIS patient for finite element analysis. Five screw-placement strategies were designed, including collocation of consecutive, interval and alternate screws instrumentation in convex or concave side. The whole surgical procedures of screw-placement strategies were simulated. And their influences in the curve correction as well as the biomechanics of the implants and implant-bone interface were analyzed. Results: The densities of pedicle screws were 100%, 79%, 64%, 57% and 50%, respectively. During curve correction, interval and alternate screws instrumentation demonstrated higher screws stress, while the higher rods and screw-rod interface was observed in consecutive screws instrumentation. When it referred to the interaction force between screws and vertebrae, a lower stress was observed in in consecutive screws instrumentation. After the fixation of rod at convex side, the maximum stress on screws in each strategy was observed in interval screws instrumentation. The higher stress of rods was observed in alternate screws instrumentation in both sides. However, the correction rate of each strategy was similar. Conclusion: There was little distinction on the curve correction rate in different screw-placement strategies. The screw-placement strategy with interval and alternate screws instrumentation has better biomechanics properties than others, except for higher maximum interaction force between screws and vertebrae.

中文翻译：

---

Lenke 1型青少年特发性脊柱侧凸不同椎弓根螺钉置入策略的有限元分析：哪个更好？

目的模拟不同椎弓根螺钉置入策略的曲线矫正过程，探讨理想策略。材料和方法：使用 Lenke 1 AIS 患者的 CT 数据构建三维模型，用于有限元分析。设计了五种螺钉置入策略，包括凸面或凹面连续、间隔和交替螺钉器械的搭配。模拟了螺钉置入策略的整个手术过程。并分析了它们对曲线矫正的影响以及种植体和种植体-骨界面的生物力学。结果：椎弓根螺钉的密度分别为100%、79%、64%、57%和50%。在曲线校正期间，间隔和交替螺钉仪器显示更高的螺钉应力，而在连续螺钉仪器中观察到较高的杆和螺杆接口。当它提到螺钉和椎骨之间的相互作用力时，在连续螺钉器械中观察到较低的应力。在凸侧固定杆后，在间隔螺钉仪器中观察到每种策略中螺钉的最大应力。在两侧的交替螺钉仪器中观察到杆的更高应力。然而，每种策略的修正率是相似的。结论：不同螺钉置入策略的曲线矫正率差异不大。除了螺钉和椎骨之间的最大相互作用力更高之外，具有间隔和交替螺钉器械的螺钉放置策略具有比其他方法更好的生物力学特性。