Which test interpretation describes SI hypomobility when sacral movement is absent or delayed?

Which test interpretation describes SI hypomobility when sacral movement is absent or delayed?

• A. Navicular drop test interpretation
• B. Windlass test interpretation
• C. Standing flexion test interpretation
• D. Stork test interpretation

Answer: (D)

The main idea is assessing sacral motion during a unilateral stance to gauge SI joint mobility. In the Stork test, a person stands on one leg and moves into a single-leg stance, which normally prompts the sacrum to rotate subtly on the fixed ilium as load shifts. If that sacral movement is absent or noticeably delayed, it points to hypomobility at the sacroiliac joint. This interpretation specifically identifies SI joint restriction as the cause of the observed lack of sacral motion. For context, other tests target different structures: the navicular drop test relates to foot arch mechanics, the Windlass test assesses plantar fascia tension, and the standing flexion test looks for asymmetry in pelvic landmarks during forward bending to flag possible SI dysfunction, but it does not directly measure sacral motion in unilateral stance like the Stork test does.

The main idea is assessing sacral motion during a unilateral stance to gauge SI joint mobility. In the Stork test, a person stands on one leg and moves into a single-leg stance, which normally prompts the sacrum to rotate subtly on the fixed ilium as load shifts. If that sacral movement is absent or noticeably delayed, it points to hypomobility at the sacroiliac joint. This interpretation specifically identifies SI joint restriction as the cause of the observed lack of sacral motion.

For context, other tests target different structures: the navicular drop test relates to foot arch mechanics, the Windlass test assesses plantar fascia tension, and the standing flexion test looks for asymmetry in pelvic landmarks during forward bending to flag possible SI dysfunction, but it does not directly measure sacral motion in unilateral stance like the Stork test does.