The term sacroiliitis is used to describe any inflammation in the sacroiliac joint, which is located on either side of the sacrum ( lower spine) that connects to the iliac bone in the hip. 3 If sacroiliitis is among the symptoms experienced by a patient, psoriatic arthritis is. Sacroiliitis ( say- kroe- il- e- I- tus) is a medical condition caused by any inflammation within one, or both, of the sacroiliac joints. Ok Meer lezen Meer lezen. If you do not want this please do not accept.