Abstract The present study aims to compare spinal stability after two different minimally invasive techniques, the lateral lumbar interbody fusion (LLIF) and the transforaminal lumbar interbody fusion (TLIF) approaches. Two nonlinear three-dimensional finite element (FE) models of the L4–L5 functional spinal unit (FSU) were subjected to the loads that usually act on the lumbar spine. Findings show that the LLIF approach yields better results for torsion load case, due to the larger surface area of the implant. For extension, flexion and lateral bending loads, the TLIF approach presents smaller displacements probably due to the anterior placement of the cage and to the smaller damaged area of the annulus fibrosus.

中文翻译：

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两种微创手术入路外侧和经椎间孔腰椎椎间融合的数值模拟

摘要 本研究旨在比较两种不同的微创技术，即外侧腰椎椎间融合 (LLIF) 和经椎间孔腰椎椎间融合 (TLIF) 方法后的脊柱稳定性。L4-L5 功能性脊柱单元 (FSU) 的两个非线性三维有限元 (FE) 模型承受通常作用于腰椎的载荷。研究结果表明，由于种植体的表面积较大，LLIF 方法在扭转载荷情况下产生了更好的结果。对于伸展、屈曲和侧弯负荷，TLIF 入路的位移较小，这可能是由于笼子的前部放置和纤维环的较小受损区域。