The Auricular Surface Of The Sacrum From A Lateral View

Description

Sweeping laterally from the sacral body, the auricular surface appears as a broad, ear-shaped articular area on the superior lateral sacrum, continuous with the alar region and approaching the sacral base superiorly. The animation maintains a lateral perspective while subtly rotating the bone to clarify the anterior versus posterior margins of the articular facet and its relationship to the sacral ala. Adjacent landmarks come into view in sequence, including the promontory region superiorly, the lateral mass, and the roughened area posterior to the auricular surface that corresponds to the sacral tuberosity for interosseous sacroiliac ligament attachment. Sacroiliac joint mechanics are difficult to teach from a single still because the articular surfaces are both irregular and obliquely oriented. By changing angle over time, the sequence helps you appreciate how the sacral auricular surface mates with the iliac auricular surface, where load transfer concentrates during standing and gait. That orientation also frames common pathology: inflammatory sacroiliitis in spondyloarthropathies, postpartum ligamentous laxity, and pain patterns targeted during fluoroscopy or CT-guided sacroiliac joint injections. Use this animation in gross anatomy and osteology labs when students handle isolated pelves, and in radiology teaching to correlate bony landmarks with oblique pelvic CT or MRI planes that include the sacroiliac joint. It also fits orthopedic and sports medicine content discussing posterior pelvic ring stability, sacral ala stress fractures, and surgical planning for sacroiliac fixation where the auricular surface and adjacent lateral mass define safe corridors. Anatomical accuracy verified by SciePro's Medical Advisory Board.