Lumbar Fusion With Rods And Screws

Description

Lumbar pedicle screw-rod instrumentation spans adjacent vertebrae in the lower spine, with paired screws seated in the right and left pedicles and their shafts advancing anteriorly toward the vertebral bodies. Posteriorly, the screw heads align along the dorsal elements, and longitudinal rods contour in the sagittal plane to couple each level into a single construct. Connections at each tulip head lock the rod, creating a continuous bridge across the instrumented segments. Hardware dominates the posterior column. Instrumented lumbar fusion is commonly selected for mechanical instability, including isthmic or degenerative spondylolisthesis, recurrent disc herniation with segmental collapse, or deformity correction where motion at a painful level must be eliminated while arthrodesis forms. The fixed viewpoint makes the pedicle trajectory easy to teach: a transpedicular corridor that keeps the screw lateral to the spinal canal and medial to the transverse process, with the vertebral body serving as the principal purchase for pullout resistance. Alignment cues matter. Misplacement risks medial breach with radicular symptoms or lateral breach with weak fixation, and the illustration helps correlate those complications with the three-dimensional bony landmarks surgeons target during freehand or navigated placement. Use this illustration in spine surgery lectures when explaining posterior instrumented fusion, in radiology teaching files when correlating postoperative hardware on AP and lateral radiographs or CT, and in device-focused educational graphics for pedicle screw-rod constructs. It also fits anatomy and biomechanics modules that cover load sharing between anterior and posterior columns at L3 to S1. Anatomical accuracy verified by SciePro's Medical Advisory Board.