What is the procedure for performing Vleeming's active straight leg raise?

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The test checks how well the pelvis and sacroiliac joints can stabilize the body and transfer load when one leg is moved, reflecting lumbopelvic stability during leg flexion. In this procedure, the patient lies on their back (supine), keeps the opposite leg relaxed and straight on the table, and actively lifts one leg to about 20 cm off the surface with the knee extended. The emphasis is on maintaining a level pelvis and avoiding compensations as the leg is raised. If the pelvis stays stable and the leg can reach the specified height without pain, the test supports good load transfer through the pelvis. If the pelvis tilts or moves, or the leg cannot reach the height, it suggests a load-transfer or pelvic-stability issue, such as sacroiliac joint dysfunction or lumbopelvic instability.