Anatomical Presentation Of Lumbar Fusion Surgery

Description

Lumbar vertebral bodies at an operative fusion site are presented with the intervertebral disc space replaced by an interbody device seated between adjacent endplates and surrounded by bone graft material. The superior and inferior vertebral endplates form the immediate cranial and caudal boundaries of the construct, while the anterior vertebral cortices and the posterior vertebral margins frame the restored interbody height. Graft is positioned in close apposition to bleeding cancellous bone along the endplate surfaces, where bridging bone is intended to form across the former motion segment. No motion remains. Arthrodesis of the lumbar spine is performed to eliminate painful segmental instability from degenerative disc disease, spondylolisthesis, recurrent disc herniation, or deformity, and this illustration focuses attention on the exact interface surgeons and radiologists scrutinize when discussing fusion status. The fixed perspective emphasizes the geometry of the interbody cage relative to the vertebral bodies, a detail that helps explain common failure modes such as subsidence into the endplate, pseudarthrosis from inadequate graft contact, or loss of segmental lordosis when the device sits too posterior or too central. For teaching, the juxtaposition of implant and graft clarifies why endplate preparation must preserve subchondral bone yet expose cancellous surface. Use this illustration in spine surgery lectures covering posterior lumbar interbody fusion (PLIF) and transforaminal lumbar interbody fusion (TLIF) principles, in orthopedic and neurosurgical atlases discussing fusion biomechanics, or in patient-facing education that needs a precise depiction of where graft is placed. It also supports radiology and outcomes manuscripts when annotating expected postoperative anatomy at the interbody fusion site on CT correlation figures. Anatomical accuracy verified by SciePro's Medical Advisory Board.