The sacroiliac joints reside in between the sacrum (the tailbone phase on the spinal column) as well as outstanding wing-like iliac bones that variety the pelvic girdle. There are 2 SI joints, a person to the still left and 1 on the best (highlighted in red inside the graphic earlier https://www.theorthopaedicandpainpractice.com/service/hip-groin-pain/