NCIt definition : A bony projection from the posterior region of the iliac crest that lies over the
sacroiliac joint and functions as the site of attachment for the thoracolumbar fascia
and the posterior sacroiliac and sacrotuberous ligaments.;
Alternative definition : CDISC: A bony projection from the posterior region of the iliac crest that lies over
the sacroiliac joint and is the site of attachment for the thoracolumbar fascia and
the posterior sacroiliac and sacrotuberous ligaments.;