The use of provocative maneuvers for test- ing SIJ dysfunction is controversial because of the high rate of false positives and the in- ability to distinguish whether the SIJ or an adjacent structure is affected. However, the diagnostic utility of specific stress tests has been studied, and clusters of tests are rec- ommended if a health care provider (HCP) suspects SIJ dysfunction. A diagnostic algo- rithm should first focus on using the distrac- tion test and the thigh thrust test. Distraction is done by applying vertically oriented pres- sure to the anterior superior iliac spine while aiming posteriorly, therefore distracting the SIJ. During the thigh thrust test the examiner fixates the patient’s sacrum against the table with the left hand and applies a vertical force through the line of the femur aiming poste- riorly, producing a posterior shearing force at the SIJ. Studies show that the thigh thrust test is the most sensitive, and the distraction test is the most specific. If both tests are pos- itive, there is reasonable evidence to suggest SIJ dysfunction as the source of LBP.