Iliac crest From Wikipedia, the free encyclopedia Bone: Iliac crest Pelvic girdle. Overview of Ilium as largest bone of the pelvis. Latincrista iliaca Gray'ssubject #57 234The crest of the ilium (or iliac crest) is the superior border of the wing of ilium and the superolateral margin of the greater pelvis. Contents [hide] 1 Anatomy