Sacroiliac Joint Pain Syndromes Sacroilitis is inflammation of the sacroiliac joint. The sacroiliac joints (SI joints) connect the spine to the pelvis and lower skeleton.Causes of SI Joint Pain:Putting strain on the joint and supporting ligaments and soft tissuesLifting while in awkward positionsArthritisCollagen vascular diseasesSigns and Symptoms:Localized painPain is constant and characterized as aching in natureMuscle spasmTesting:Plain X-raysMRIBone ScanLab WorkTreatment:Drug TherapyHeat and Cold TherapySacroiliac Joint Rhizotomy