In Vleeming's active straight leg raise, which joint is adjusted?

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The main idea here is that Vleeming’s active straight leg raise tests how the pelvis and sacroiliac joints handle load transfer when the leg is lifted. As the leg rises, the pelvis must stay stable and the force from the leg has to pass through the pelvic ring to the spine. The sacroiliac joints adjust to allow this, by small movements between the sacrum and the ilia (nutation/counternutation and subtle rotations) so the pelvis remains aligned and the load can move up the spine without excessive motion in the lower back. That adjustment of the SI joints is what the test is designed to assess. The hip joints, knees, and lumbar spine contribute to the movement, but the critical adaptations during this maneuver occur at the sacroiliac joints.