iliac tuberosity iliac tuberosity behind the iliac fossa is a rough surface, divided into two portions, an anterior and a posterior. the posterior portion, known as the iliac tuberosity, is elevated and rough, for the attachment of the posterior sacroiliac ligaments and for the origins of the sacrospinalis and multifidus. iliac tuberosityright hip bone. external surface.right hip bone. internal surface.detailsidentifierslatintuberositas iliacata98a02.5.01.122ta21338fma16908anatomical terms of bone