Anatomic Presentation Of Lateral Lumbar Interbody Fusion

Description

Lumbar vertebral anatomy is presented from a lateral perspective, centered on the L4 vertebral body and the intervertebral level immediately superior to it. A structural interbody cage occupies the disc space, seated against the superior endplate of L4 and aligned to restore disc height while spanning the anterior to posterior columns within the interbody footprint. Adjacent vertebral bodies and their cortical margins frame the implant, with the anterior longitudinal ligament region anteriorly and the posterior vertebral body line and canal margin posteriorly providing orientation. Lateral lumbar interbody fusion (LLIF) is commonly selected for degenerative disc disease, adult deformity, and low grade spondylolisthesis when surgeons want height restoration and indirect neural decompression without a posterior midline exposure. The fixed lateral vantage makes the cage position relative to L4 endplate contours easy to judge, including how the implant sits on subchondral bone and how much anterior coverage is achieved, both of which correlate with subsidence risk and segmental lordosis. Endplate violation is unforgiving. For teaching, the image supports discussion of transpsoas corridor considerations at L4, where the lumbar plexus lies within or just posterior to the psoas and influences retractor placement and neuromonitoring strategy. Spine surgery courses and orthopedic or neurosurgical residency lectures can use this illustration to anchor step planning for LLIF, correlate implant choice with sagittal alignment goals, and explain why supplemental posterior fixation is often added. Medical publishers will also find it well suited for atlas plates, device overviews, and complication chapters addressing subsidence, cage migration, and vascular or plexus-adjacent risk at the L4 level. Anatomical accuracy verified by SciePro's Medical Advisory Board.