Abstract This paper presents a finite element analysis to investigate the biomechanical changes caused by transforaminal (TLIF) and anterior lumbar interbody fusion (ALIF) at the L5-S1 level, applying two different implants: T_PAL (TLIF) and SynFix (ALIF). The main objective is to determine which one is more stable for patients. Numerical simulations of segmental motion show that, in the early postoperative phase, displacements and rotation angles obtained in ALIF are greater than the corresponding ones obtained in TLIF, as well as the principal stress values on the ligaments. So, TLIF performed with T_PAL is more stable than ALIF, especially during the recovery phase.

中文翻译：

---

L5-S1水平微创经椎间孔和前路腰椎椎间融合手术

摘要 本文提出了一种有限元分析，以研究在 L5-S1 水平由经椎间孔 (TLIF) 和前路腰椎椎间融合术 (ALIF) 引起的生物力学变化，应用两种不同的植入物：T_PAL (TLIF) 和 SynFix (ALIF)。主要目标是确定哪一种对患者更稳定。节段运动的数值模拟表明，在术后早期阶段，ALIF 中获得的位移和旋转角度大于 TLIF 中获得的相应值，以及韧带上的主应力值。因此，使用 T_PAL 执行的 TLIF 比 ALIF 更稳定，尤其是在恢复阶段。