The sacroiliac joint (SI joint) is one of two joints in your pelvis that connect the tailbone (the sacrum) and the large pelvic bone (the ilium). The SI joints connect your spine to the pelvis, and thus, the entire lower half of the skeleton.

Disease FAQs

Q. I thought I had a problem with my back. My doctor examined me and said it's not my back, but that I have a sacroiliac dysfunction. What is a sacroiliac dysfunction, and can I be sure that I don't have problems with my back?

Q. What is the difference between a ruptured disc and a herniated disc?

Q. What is the difference between a bulging disc and a herniated disc?

Q. I have degenerative disc disease with spurs in my back and neck. Do you think I'll be in much pain the older I get?

Q. I recently saw my family doctor for pain in my calf and foot. My family doctor said I have a herniated disc in my low back, so she referred me to a spine specialist. Can this be true? How can this pain be coming from something in my back?

Q. I had scoliosis as a teenager and was told that it would stop after I stopped growing. I'm 32 now, and it seems to be getting worse. Could this be something else happening, or is the scoliosis getting worse? Will I need surgery?