A clinical exam test to determine if a person has SI (sacro-iliac) joint pain. To perform the test, the patient lies on their stomach.  The examiner uses one hand to stabilize the pelvis while the other hand lifts the leg off the table.  If the patient has pain over the buttock, it may suggest SI joint pain.  If the pain is in the front of the thigh, it may suggest nerve pain from stretching the femoral nerve.  Back pain may indicated pain coming from the lumbar spine.