The examiner exerts anterior pressure on the iliac wings with both hands.
By crossing his or her hands, the examiner adds a lateral force vector to the compression.
The anteroposterior direction of the compressive load on the pelvis places stress on the posterior portions of the sacroiliac joint, whereas the lateral component places stress on the anterior sacroiliac ligaments.
What does a positive Sacroiliac Stress Test mean?
Deep pain is a sign of strained anterior sacroiliac ligaments on the side of the pain (sacrospinous and sacrotuberous ligaments).
Pain in the buttocks can be produced by compression from the examining table or by irritation of the posterior portions of the sacroiliac joint.
Determining the precise location of the pain helps to identify its cause.