Relax/stretch targets during Vleeming's active straight leg raise include which muscle?

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During the Active Straight Leg Raise, the focus is on allowing the pelvis to stay stable while the leg lifts. Relaxing the hip’s deep rotator muscles that cross the sacroiliac joint helps the pelvis remain neutral and reduces unwanted pelvic motion that can block a smooth leg raise. The piriformis fits this role because it’s a deep external rotator crossing the SI joint; if it’s tight, it can alter sacral and pelvic mechanics during the lift. By letting the piriformis relax, the leg can rise more freely without compensatory pelvic tilting or SIJ stress.

The other muscles listed aren’t the primary relaxation targets for this maneuver. Quadriceps mainly extend the knee and aren’t the limiting factor in the leg-raise motion. The hamstrings influence hip flexion only if very tight, but they’re not the key muscle the test aims to relax for pelvic stability. Gluteus medius acts to stabilize the pelvis during movement, so it’s more about maintaining alignment than being a relaxation target.