Anatomical Presentation Of A Lateral Lumbar Interbody Fusion

Description

Lumbar vertebral bodies in the mid to lower spine frame a lateral lumbar interbody fusion construct, with an interbody cage seated within the disc space between adjacent endplates. The implant spans mediolaterally across the apophyseal ring, restoring disc height while remaining centered between the anterior longitudinal ligament anteriorly and the spinal canal and posterior longitudinal ligament posteriorly. From a lateral approach, the working corridor aligns with the lateral annulus fibrosus and the retroperitoneal space, where the psoas major lies directly lateral to the vertebral bodies and the lumbar plexus traverses within its substance. Implant position is the focal point. Lateral lumbar interbody fusion (LLIF) is selected for degenerative disc disease, low-grade spondylolisthesis, and adult deformity when indirect decompression can relieve foraminal stenosis by re-tensioning the annulus and ligamentum flavum through disc height restoration. Cage footprint and endplate contact matter because subsidence risk increases with endplate violation, osteopenia, or undersized implants, and because anterior placement can improve segmental lordosis while posterior malposition threatens the traversing nerve roots and dural sac. The fixed perspective supports teaching the relationship between the interbody device and the bony endplates, a common source of postoperative settling and recurrent radiculopathy. Spine surgeons and surgical educators can use this illustration in LLIF approach discussions, implant selection guides, and informed-consent materials that explain how a cage stabilizes the lumbar motion segment without direct posterior decompression. It also fits anatomy and biomechanics coursework that links lumbar vertebral geometry, disc space restoration, and foraminal dimensions to clinical symptoms and exam findings. Anatomical accuracy verified by SciePro's Medical Advisory Board.