If a seated flexion test is positive on the right and the patient has an oblique axis dysfunction/torsion, what is the location of the axis relative to the dysfunction?

• A. The same side as dysfunction
• B. Axis is opposite the side of dysfunction
• C. It depends on patient
• D. None of the above

Answer: (B)

In sacral torsions with an oblique axis, the axis of rotation sits on the opposite side from the dysfunctional sacroiliac joint. The seated flexion test points to which SI joint is not moving normally; in an oblique-axis torsion, the sacrum rotates about an axis on the opposite side, so the positive test side is the one away from that axis.

So if the seated flexion test is positive on the right, the axis is on the left.