The Sacroiliac Joints are located at the bottom of the back. You have one either side of the spine. The Sacroiliac joints help make up the rear part of the pelvic girdle.
These joints can often get stuck or in some cases one half of the pelvis can glide forwards or backwards, which is often referred to as a twisted pelvis. When this occurs it often irritates the Iliolumbar ligament which results in Inflammation. This is usually indicated by tenderness around the bony lumps which you can feel if you place your thumbs either side of your lower back.
Inflammation of the sacroiliac joints and associated ligaments are very common, especially following pregnancy where the hormone relaxing is released and this results in the relaxation of ligaments in preparation for childbirth. In most cases the causes of sacroiliitis are mechanical, however there may be other medical inflammatory conditions present such as Ankylosing Spondylitis as well as others which will need attention.