Fig. 1From: Biomechanical analysis of single-level interbody fusion with different internal fixation rod materials: a finite element analysisFE models of the spine with and without implants. a The osseous structures, intervertebral discs, and ligaments of the intact spine. b At the L4-L5 disc space, the cage was placed obliquely with the removal of left posterolateral corner of the annulus fibrosus, as in TLIF procedures. c Five FE models used in this studyBack to article page