This injection is used in order to determine if the suspected diagnosis is correct. The sacroiliac joint is numbed using a local anesthetic. Once the area has been injected, the patient will be asked to move around in ways that would generally cause them pain. If they experience relief of at least 75% then a diagnosis is made tentatively. A second injection is them performed using another type of numbing medication to help with a diagnosis confirmation.
See also Sacroiliac Joint Injection.