The sacroiliac joints reside amongst the sacrum (the tailbone segment with the spinal column) plus the well known wing-like iliac bones that form the pelvic girdle. There are 2 SI joints, a single on the remaining and one particular on the right (highlighted in red within the graphic earlier mentioned), https://front-hip-pain-treatment65318.bloggazza.com/33157903/the-basic-principles-of-front-hip-pain-treatment