Interosseous sacro-iliac ligament
Joints and ligaments · Latin: Ligamentum sacroiliacum interosseum
The interosseous sacroiliac ligament, also known as the axial interosseous ligament, is a ligament of the sacroiliac joint that lies deep to the posterior ligament.
It connects the tuberosities of the sacrum and the ilium of the pelvis.
Definition from Wikipedia, CC BY-SA 4.0.