Lateral Sacral Crest, Lateral View

Description

Lateral sacral crest dominates the posterolateral margin of the sacrum in this lateral view, appearing as a longitudinal ridge created by fusion of the transverse processes of the sacral vertebrae. Immediately anterior to the crest lies the sacral ala and the lateral mass that contributes to the auricular surface for the sacroiliac joint, while posteriorly the rough dorsal surface transitions toward the intermediate and median sacral crests. Superiorly, the crest approaches the level of the S1 superior articular process and the base of the sacrum; inferiorly it tapers toward the inferolateral angle near the coccygeal attachment. Palpation and fixation landmarks in the posterior pelvis often hinge on this ridge, and this illustration clarifies where the lateral sacral crest sits relative to the sacroiliac joint line and the dorsal surface topography used during posterior approaches. In sacral fractures and sacroiliac disruption, screw corridors and plate positioning depend on accurate appreciation of the lateral mass and adjacent cortical contours, and the lateral perspective helps separate the crest from the more medial posterior sacral foramina that transmit dorsal rami. Surface anatomy matters here. Subtle changes in ridge prominence can also guide teaching about sacralization, lumbosacral transitional vertebrae, and the way fused elements reshape the posterior pelvic ring. Orthopaedic and trauma teams can place this illustration in operative planning discussions for posterior pelvic fixation (including iliosacral and transiliac-transsacral constructs) to orient trainees to the palpable bony ridge they meet during exposure. Anatomy faculty will find it well suited for pelvis and vertebral column modules, pairing with CT-based teaching on sacral morphology and safe zones, and medical publishers can use it as a labeled plate for Terminologia Anatomica terms (crista sacralis lateralis, ala ossis sacri, facies auricularis). Anatomical accuracy verified by SciePro's Medical Advisory Board.