Appendicular skeletal bone that articulates with sacrum is

Ilium is the appendicular skeletal bone that articulates with sacrum.

The pelvic (hip) girdle consists of two hip bones. Each hip bone consists of three parts: the ilium, pubis, and ischium. The hip bones, sacrum, and pubic symphysis form the bony pelvis. It supports the vertebral column and pelvic viscera and attaches the free lower limbs to the axial skeleton. The ilium is the superior portion of the hip bone which articulates with the sacrum.