The current "gold standard" for diagnosis of sacroiliac joint dysfunction emanating within the joint is sacroiliac joint injection confirmed under fluoroscopy or CT-guidance using a local anesthetic solution. The diagnosis is confirmed when the patient reports a significant change in relief from pain and the diagnostic injection is performed on 2 separate visits. Published studies have used at least a 75 percent change in relief of pain before a response is considered positive and the sacroiliac joint deemed the source of pain.    However, several other injection studies have compared intra-articular with extra-articular injection, and indicate that the ligament injection behind the joint is oftentimes superior to injection in the joint and seems to be a very underutilized diagnostic tool.  
The sacroiliac joints lie next to the spine and connect the sacrum with the hip on both sides. There are two sacroiliac joints, one on the right and one on the left. Joint inflammation and/or dysfunction in this area can cause pain. Read more about Sacroiliac Joint Dysfunction . The purpose of a sacroiliac joint injection is two-fold: to diagnose the source of a patient's pain, and to provide therapeutic pain relief. At times, these are separated and a patient will undergo a purely diagnostic or therapeutic injection, although often the two are combined into one injection.
It is important that you do the poses on one side only, and that you keep your breath soft and moving freely. I like to exhale naturally several times on the pumping motions. It is also helpful if you begin to pay attention to how you are sitting, sleeping, and standing. It is asymmetrical and habitual movements which can overstretch the ligaments around the joint and lead to increased instability. Sacroiliac dysfunction is usually related to posture, be that standing, sitting, sleeping, or in yoga practice. Learning to move the pelvis and sacrum together is the key to preventing this. It is a simple solution to a complex problem.