The anterior inferior iliac spine, often abbreviated AIIS, is a rough bony projection on the anterior border of the ilium, one of the three bones that make up the hip bone. The anterior inferior iliac spine is located inferior to the anterior superior iliac spine and is found immediately above the acetabulum. A straight tendon of the rectus femoris muscle originates from the upper part of the spine, whereas the proximal end of the iliofemoral ligament attaches to the lower part. The iliacus muscle also arises from around the anterior inferior iliac spine as well as from the iliac fossa.
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