Anterior Inferior Iliac Spine Of The Hip Bone, Anterior View

Description

Anterior inferior iliac spine (AIIS) projects from the anterolateral ilium just inferior to the anterior superior iliac spine (ASIS) and immediately superior to the acetabular rim, forming a palpable, angular buttress above the hip joint. From this frontal anterior perspective, the AIIS sits lateral to the pelvic brim and superior to the acetabular notch region, with the iliac body expanding medially into the iliac fossa and laterally into the supra-acetabular surface. Bony contours around the acetabulum frame the AIIS inferiorly, while the smoother anterior iliac surface rises superiorly toward the ASIS. A fixed landmark. Clinically, the AIIS matters because it anchors the straight head of rectus femoris and marks the superior margin of the anterior hip capsule, so small variations in its morphology can translate into anterior hip pain and limited flexion from subspine impingement (AIIS-type morphology) even when the acetabular rim itself looks acceptable. Adolescent athletes also injure this site, with apophyseal avulsion of the AIIS during forceful hip flexion and knee extension, a pattern that can be confused with acetabular pathology without a clear mental map of the supra-acetabular region. The anterior frontal lighting and isolated bony surface detail in this illustration support teaching of origin sites, capsular attachments, and the relationship of the AIIS to the superior acetabular margin, which is the reference line for many arthroscopic and open subspine decompression discussions. Use this illustration in gross anatomy and musculoskeletal courses to anchor pelvic surface anatomy, and in orthopaedic or sports medicine materials addressing rectus femoris injuries, AIIS avulsion fractures, and femoroacetabular impingement with subspine involvement. It also fits preoperative planning documents and patient-facing handouts where a single anterior landmark above the acetabulum needs to be identified without distraction. Anatomical accuracy verified by SciePro's Medical Advisory Board.