Anterior Superior Iliac Spine On The Hip Bone

Description

Anterior superior iliac spine (ASIS) projects from the anterior end of the iliac crest as a thickened, rounded prominence, seen here from a medial perspective that emphasizes its relationship to the internal surface of the ilium. Posteriorly, the crest sweeps toward the iliac tubercle, while inferior to the ASIS the anterior border of the ilium descends toward the anterior inferior iliac spine (AIIS) and the supra-acetabular region. Medially, the iliac fossa occupies the broad concavity of the ala, and the pelvic brim can be inferred as it courses toward the arcuate line. Orientation is explicit. The ASIS sits anterior, superior, and lateral relative to the acetabulum and pubis, making it a reliable landmark in pelvic surface anatomy. ASIS matters because so many clinically relevant attachments and neurovascular relationships cluster around it: the inguinal ligament anchors here and runs medially to the pubic tubercle, and the sartorius and tensor fasciae latae originate from the anterior iliac crest and ASIS region, a common site of traction-related pain. In adolescents and young athletes, an ASIS apophyseal avulsion fracture is a classic injury after sudden hip extension or sprinting, and the fixed medial view helps distinguish the bony prominence from adjacent anterior iliac contouring that can be mistaken for a fragment on radiographs. The lateral femoral cutaneous nerve typically passes just medial to the ASIS beneath the inguinal ligament, a spatial relationship that underlies meralgia paresthetica and makes this bony point a surgical and injection landmark. Use this illustration in gross anatomy and musculoskeletal courses when teaching pelvic osteology, inguinal ligament attachments, and anterior hip landmarks, and in orthopedic or sports medicine texts discussing pelvic apophyseal injuries and meralgia paresthetica. It also suits patient-education diagrams and preoperative planning materials where a precise ASIS reference improves communication around incision placement and regional anesthesia landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.