![Posterior view of the SI JoInt labeling posterior sacroiliac ligament](https://veritas.widen.net/content/cpdjt21qqk/png/Adult-Spine-sacroiliac-ligaments-back-view.png?use=idsla&color=&retina=false&u=at8tiu&w=974&h=548&crop=yes&k=c)
The posterior SI ligament runs along the back of the SI joint. The ligament connects the back of the hip bones (posterior-superior iliac spine and iliac crest) to the sacrum.
![Anterior view of the SI JoInt labeling anterior sacroiliac ligament](https://veritas.widen.net/content/eq8yobg3sq/png/Adult-Spine-sacroiliac-ligaments-front-view.png?use=idsla&color=&retina=false&u=at8tiu&w=974&h=548&crop=yes&k=c)
The anterior SI ligament covers the front of the SI joint, which includes the articular (joint) capsule that encloses the joint in this area.
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![Anterior view of the SI JoInt labeling the sacroiliac joint](https://veritas.widen.net/content/v15osqeqva/png/SI-Joint.png?use=idsla&color=&retina=false&u=at8tiu&w=974&h=548&crop=yes&k=c)
The SI joints connect the sacrum at the base of the spine with the hip bone. These joints also protect the lowest motion segment of the spine, L5-S1, through their limited motion and the very strong ligaments that interconnect with the L5-S1 segment.
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Prolotherapy injections for back pain are typically given in the ligaments and joint spaces of the lower back and/or pelvis.