Acupuncture is effective at addressing the pain originating from the sacroiliac joint. The dysfunction that occurs at the sacroiliac joint (SI) is a major cause of low back pain. This joint attaches the sacrum (the lowest segment of the spine) to pelvis. A number of factors like pregnancy and differences in leg lengthen can contribute to SI joint pain. Acupuncture can be used to decrease the local inflammation and calm the tension and trauma surrounding the muscles in the area.