The sacroiliac joints (SI joints) connect the spine to the pelvis and are located between the sacrum, which is the triangular shaped bone at the bottom of the spine, and the iliac bones on either side of the pelvis. The joints are held together by strong ligaments and support the entire weight of the upper body when standing erect which places large amount of stress across them.
Sacroiliac joint pain can be caused by sprain/strain injury, wear and tear of the joints, or occasionally a forms of arthritis that cause inflammation, restrictions, and pain.
Conditions that affect the normal walking patterns, such as a leg length differences, or pain in the hip, knee or foot will also place increased stress on the sacroiliac joints and can result in strains or accelerated wear and tear of the joints.
Another common cause of SI pain is pregnancy as the hormone relaxin is released to allow the ligaments to stretch during childbirth. This can cause increased movement in the joints which can cause increased stress and abnormal wear and tear. Sacroiliac joint pain during pregnancy is referred to as pelvic girdle pain (PGP).
Chiropractic treatment of sacroiliac joint pain involves manipulations and/or mobilisations of the joints to restore normal movement and function, and soft tissue work to relieve muscular tensions.