Articular Facet Of The Lumbar Vertebra, Lateral View

Description

Lumbar zygapophysial (facet) joint anatomy is centered on the superior and inferior articular processes, whose articular facets form a synovial joint posterolateral to the vertebral body. From a lateral perspective, the articular facet appears as a smooth, slightly curved bony surface on the posterior arch, with the superior articular facet positioned superiorly and posteriorly relative to the pedicle and the inferior articular facet projecting inferiorly toward the subjacent vertebra. The pars interarticularis bridges between the superior and inferior articular processes, while the lamina lies posterior to the pedicle and contributes to the vertebral arch. Orientation is the key. Facet joint morphology in the lower back underlies both normal load sharing and common pain generators. Lumbar facet arthropathy and synovial cysts arise at the zygapophysial joint and can contribute to foraminal or lateral recess stenosis, a relationship that becomes easier to teach when the articular surface is isolated and the margins of the articular process are sharply defined. The pars interarticularis is equally clinically loaded: stress reactions and spondylolysis classically involve this segment between the articular processes, and a lateral view helps explain why defects can destabilize the posterior elements without directly involving the vertebral body. Use this illustration in spine anatomy and orthopedic teaching modules to anchor discussions of facet joint planes (more sagittal in the lumbar region), segmental instability, and target selection for medial branch blocks or radiofrequency denervation. It also fits radiology or surgical education when correlating oblique lumbar radiographs and CT findings with posterior element landmarks at a single vertebral level. Anatomical accuracy verified by SciePro's Medical Advisory Board.