During Vleeming's active straight leg raise, how high should the leg be raised?

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The test is probing how well the lower spine and pelvis can stay stable while the leg is lifted. Lifting to a moderate, standardized height provides enough challenge to the hip flexors and trunk stabilizers to reveal any lumbopelvic control issues, without forcing compensations from the pelvis tilting or the spine bending excessively. This specific height keeps the movement reproducible across clinicians and patients, so you can reliably detect instability or sacroiliac dysfunction. If the leg is raised too little, subtle stability problems might be missed; if raised too high, the movement may rely more on hip motion or pelvic tilt, obscuring lumbopelvic control. Hence, the standard moderate height is the best choice.