Torque is used to correct which component?

• A. PI/AS
• B. Sacral base
• C. IN/EX
• D. Leg length

Answer: (C)

Torque is a twisting force used when a vertebral or pelvic segment is rotated around a vertical axis. When a segment’s orientation is off in its internal or external rotation, applying torque helps unwind that rotation and restore neutral alignment. That rotational correction is what IN/EX refers to—internal rotation versus external rotation.

Leg-length differences involve vertical height and overall limb alignment rather than rotation around an axis, so torque isn’t the primary method for addressing that. Likewise, sacral base orientation and related sagittal-plane geometry describe how the pelvis sits rather than how a segment twists, so they’re not the target of a twisting torque adjustment. In short, torque specifically corrects rotational misalignment—internal or external rotation.