Which of the following describes the expected response of the PSIS during the standing flexion test?

The standing flexion test is used to assess sacroiliac joint function and to evaluate potential dysfunction or asymmetry in the pelvis. During this test, the patient stands while the clinician observes the movement of the posterior superior iliac spine (PSIS) as the patient bends forward to touch their toes.

In a healthy, symmetrical pelvis, as the individual flexes forward, the PSIS on both sides should move in a similar manner. However, if one side remains higher or moves differently compared to the other side, it indicates potential dysfunction.

When we consider the movement of the PSIS during flexion, if there is a restriction or hypomobility on one side of the sacroiliac joint, that PSIS may not move inferiorly like the other side does; instead, it may appear to move superiorly in relation to the other PSIS. This is due to the asymmetrical position caused by dysfunction in the joint or the surrounding structures. Therefore, the expected response of the PSIS during the standing flexion test can indicate which side is affected, providing valuable information for diagnosis and treatment planning. The elevation of the PSIS suggests that there may be a restriction or dysfunction on that side, making the observation of superior movement