Anatomic Presentation Of Lateral Lumbar Interbody Fusion

Description

Oblique lateral access to the lumbar spine frames the L4 vertebral body in profile, with adjacent L3 to L4 and L4 to L5 disc spaces forming the operative corridor. The animation tracks a structural interbody cage seated within the L3 to L4 intervertebral space, spanning from the left lateral annulus toward the contralateral apophyseal ring to restore disc height. As the sequence advances, the implant’s position is read against the anterior vertebral body margin and the posterior vertebral line, clarifying how the cage remains anterior to the spinal canal while still supporting the middle column. Bony endplates and the disc space geometry stay visible as reference surfaces. Lateral lumbar interbody fusion (LLIF) is chosen to achieve indirect decompression by re-tensioning the annulus fibrosus and ligamentum flavum, increasing foraminal height without a direct posterior laminectomy. Seeing the cage advance in a stepwise manner makes the risk zones easier to teach: the lumbar plexus within the psoas major (most relevant at L4 to L5), the segmental vessels along the lateral vertebral body, and the need to avoid endplate violation that can drive subsidence. Cage footprint and anterior posterior placement matter. Small shifts translate into different sagittal alignment and stability outcomes. Use this animation in spine surgery teaching modules on LLIF/XLIF/OLIF approaches, in implant training that compares cage profiles and footprints, or in journal and conference figures explaining indirect decompression for degenerative disc disease, spondylolisthesis, and foraminal stenosis at L3 to L4. It also fits patient-facing education when you need a clear lateral spine narrative without posterior hardware distracting from the interbody construct. Anatomical accuracy verified by SciePro's Medical Advisory Board.