The sacroiliac joints reside involving the sacrum (the tailbone section of the spinal column) along with the popular wing-like iliac bones that sort the pelvic girdle. There are 2 SI joints, just one about the still left and 1 on the ideal (highlighted in purple inside the graphic above), and https://www.theorthopaedicandpainpractice.com/service/hip-groin-pain/