Sacroiliac Joint Dysfunction (SJD)  also known as Sacroiliitis, is a condition that directly affects the sacroiliac joints that reside in the lumbar region of the spine. These joints sit right where the spine and pelvis connect with several ligaments supporting them. Studies show that almost everyone will experience lower back pain at some point in their life, however, there are so many conditions that cause lower back pain, diagnosing the cause can sometimes be difficult.