The posterior inferior iliac spine is a bony projection on the posterior border of the ilium, below the posterior superior iliac spine and above the greater sciatic notch. It marks the lower end of the auricular surface of the sacroiliac joint and gives attachment to the sacrotuberous ligament.
| Articulations |
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|---|---|
| Landmarks |
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| Ossification | Formed from the iliac primary centre, which appears at about the eighth fetal week. |
The posterior inferior iliac spine is not palpable but is a landmark on imaging and during posterior pelvic surgery for the lower margin of the sacroiliac joint. Sacroiliac joint injections are directed toward the lower part of the joint near this spine.
Pain from the lower sacroiliac joint is felt over the buttock near the PSIS and PIIS and may radiate to the posterior thigh.
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