For over one hundred years, after the standing SI joint test showed that the PSIS moved with the sacrum, it has been believed that the SI joint is "stuck" in the majority with low back pain. A simple test is disproving this. Try this: Landmark the PSIS to sacrum and have the patient do hip abduction directly lateral in the coronal plane from closed to the maximum that the patient can achieve At 15 cm increments. In virtually all of the patients with a positive for a stuck SI joint the PSIS will move superior and lateral to the sacrum. When the PSIS to ASIS is measured on the side of the supposed stuck SI joint, the innominate bone will move into anterior rotation.

The true condition of the patient is better described as APAS, asymmetric pelvic angle syndrome. The research paper on this is being prepared.

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