If the AS correction is applied, what is the sign of the femur height change?

• A. Positive
• B. Negative
• C. No change
• D. Variable

Answer: (B)

The sign of the femur height change after an AS correction is negative because this specific adjustment tends to shorten the femur height on the corrected side relative to the other side. An AS correction adjusts the sacroiliac/pelvic alignment to bring the pelvis into a more balanced position, which reduces the vertical measure on the side you’re correcting. In practice, this means the femur height appears smaller on that side after the correction.

If the change were positive, it would imply the femur height increased on the corrected side, which isn’t the expected directional effect of this correction. No change would suggest the correction had no effect on the femur height, which contradicts the intended biomechanical shift. A variable change would indicate inconsistent results, which isn’t the typical outcome when applying a defined AS correction.