Sacroiliitis is also a term that is sometimes used interchangeably with the term sacroiliac joint dysfunction, as technically either term can be used to describe pain that stems from the sacroiliac joint (or SI joint).he most common symptoms of sacroiliitis include some combination of the following: 1  Fever. 2  Pain, usually low back pain, leg pain (may be in the front of the thigh), hip pain, and/or buttock pain.