Lumbar Fusion With Rods And Screws

Description

Posterior lumbar instrumentation is rendered with paired pedicle screws seated in the pedicles of adjacent lumbar vertebrae, their tulip heads aligned to accept longitudinal rods running craniocaudally on the left and right. The animation steps through placement and final tightening, showing how the construct spans the intervertebral level to couple the superior and inferior segments into a single load-sharing unit. Screw trajectories angle from a posterior entry point anteromedially toward the vertebral body, staying lateral to the spinal canal. Set screws lock the rods into the screw heads. This construct matters any time segmental motion must be eliminated to treat mechanical back pain or instability, commonly after degenerative spondylolisthesis, recurrent disc herniation with instability, or traumatic compression fractures requiring posterior stabilization. Watching the sequence clarifies the relationship between pedicle anatomy and safe screw path, a point that static diagrams often flatten, and it helps explain to learners why malposition can threaten the traversing nerve root in the lateral recess or violate the medial pedicle wall. Rod contouring and final compression or distraction across the level also become easier to grasp in motion. Alignment is the story. Use it in orthopedic and neurosurgical teaching on pedicle screw fixation, in spine fellowship lectures on construct biomechanics, and in patient-facing modules explaining why fusion reduces painful motion at a diseased segment. It also fits atlases and journal pieces discussing revision strategies, hardware failure, or adjacent segment disease after instrumented lumbar fusion. Anatomical accuracy verified by SciePro's Medical Advisory Board.