Where is the Sacroiliac Joint?
The sacroiliac or SI joint is located in your pelvis and connects the iliac bone (pelvis) to your sacrum (the lower extremity of your spine – just above your tailbone). This SI joint is responsible for transferring weight, as well as forces between the upper body and the legs. Thus, it acts as an essential component for energy transfer between your torso and the legs.
The sacroiliac joint in humans is stabilized by a group of ligaments and muscles.