Lumbar Fusion Procedure, Posterior View

Description

Lumbar vertebrae are presented from a posterior perspective with segmental fixation spanning adjacent levels, centered on the midline spinous processes and paired laminae. Pedicle screws sit lateral to the spinal canal, their heads connected by longitudinal rods that track inferior to superior along the posterior elements, keeping the fused segment in line. Transverse processes extend laterally as bony landmarks, while the interspinous spaces and facet joint regions frame the construct on each side. Hardware alignment is the focus. Posterior lumbar fusion matters because pedicle-based instrumentation is the workhorse construct for degenerative spondylolisthesis, instability after decompression, and many fracture patterns requiring short-segment stabilization, and the relationship between screws, rods, and the posterior bony anatomy determines both biomechanical purchase and the safe corridor away from the canal. The fixed posterior viewpoint helps clarify symmetry, rod contour, and segment selection in a way that parallels the surgeon’s orientation during an open posterior approach. Small errors are obvious. Subtle medial breach risk at the pedicle is easier to teach when screw trajectories are read against the lamina and spinous processes rather than against an abstract axis. Use this illustration in orthopedic and neurosurgical spine curricula when introducing posterior instrumentation, in patient-facing education for explaining why “hardware” spans specific lumbar segments, and in medical publishing to accompany chapters on pedicle screw placement, construct failure, and adjacent segment disease after fusion. Anatomical accuracy verified by SciePro's Medical Advisory Board.