Stork test interpretation indicates SI hypommobility when sacral movement is absent or delayed. Which of the following best represents this interpretation?

Stork test interpretation indicates SI hypommobility when sacral movement is absent or delayed. Which of the following best represents this interpretation?

• A. Absent or delayed sacral movement indicates SI hypomobility
• B. Absent sacral movement indicates SI hypermobility
• C. Delayed sacral movement indicates lumbar dysfunction
• D. Absent or delayed sacral movement indicates sacroiliac inflammation

Answer: (D)

The Stork test checks sacroiliac joint mobility during single-leg stance. If the sacrum on the stance side does not move or moves only slowly, it points to hypomobility of the SI joint on that side, meaning the joint is stiff or restricted rather than freely moving. This interpretation focuses on mechanical motion of the SI joint rather than inflammation or other issues. Inflammation would not produce a reliable pattern of absent or delayed sacral movement on this test, and hypermobility would present as too much, not too little, movement. Delayed movement can be related to other pelvic or spine mechanics, but the primary reading of this test is SI hypomobility.

The Stork test checks sacroiliac joint mobility during single-leg stance. If the sacrum on the stance side does not move or moves only slowly, it points to hypomobility of the SI joint on that side, meaning the joint is stiff or restricted rather than freely moving. This interpretation focuses on mechanical motion of the SI joint rather than inflammation or other issues. Inflammation would not produce a reliable pattern of absent or delayed sacral movement on this test, and hypermobility would present as too much, not too little, movement. Delayed movement can be related to other pelvic or spine mechanics, but the primary reading of this test is SI hypomobility.