Ala Of The Ilium, Lateral View

Description

Iliac ala (wing) dominates the lateral aspect of the os coxae, with the iliac crest forming a thickened superior border that arcs from the anterior superior iliac spine (ASIS) posteriorly toward the posterior superior iliac spine (PSIS). Inferior to the crest, the broad gluteal surface carries the posterior, anterior, and inferior gluteal lines, subtle ridges that demarcate the origins of gluteus maximus, medius, and minimus on the lateral ilium. Along the posterior margin, the PSIS and posterior inferior iliac spine (PIIS) sit superior to the greater sciatic notch, while the anterior border transitions toward the AIIS and the supra-acetabular region. Landmarks are crisp. Palpable iliac crest and ASIS landmarks anchor physical examination and procedural planning, from measuring pelvic obliquity and leg length discrepancy to localizing the McBurney region and planning anterior approaches to the hip. Orthopaedic and trauma teams also rely on the lateral iliac surface when discussing iliac wing fractures, pelvic ring disruptions, and external fixator pin placement, where the thickness of the iliac crest and the contour of the gluteal surface guide safe corridors. The fixed lateral perspective supports teaching of muscle attachment maps and bony buttresses, clarifying where the gluteal lines sit relative to the crest and posterior spines, a relationship that is often lost in simplified pelvis diagrams. Use this illustration in gross anatomy labs, MSK radiology teaching files (correlating with pelvic inlet and outlet radiographs), and surgical education materials covering iliac crest bone graft harvest sites and pelvic fracture classification. Anatomical accuracy verified by SciePro's Medical Advisory Board.