Ischium Articulation: Connecting the Pelvis - Ilium & Pubis

Yes, the ischium articulates with both the ilium and pubis. The ischium is one of the three bones that form the pelvis, along with the ilium and pubis. These three bones come together at a joint called the sacroiliac joint, and the ischium articulates with both the ilium and pubis at this joint.