Which of the following is a sacral torsion pattern?

Which of the following is a sacral torsion pattern?

• A. Right-on-right or Left-on-left
• B. Nutation
• C. Counternutation
• D. Nutations with counternutations

Answer: (A)

A sacral torsion involves rotation of the sacrum around one of its oblique axes, so both sides rotate in the same direction. That pattern is described as right-on-right or left-on-left, which directly names the torsional rotation on a specific oblique axis. Nutation and counternutation, on the other hand, are tilts of the sacral base in the sagittal plane (anterior or posterior tilt), not a torsional rotation. Nutation with counternutation isn’t a standard torsion pattern either. So the best answer is the one that names a true torsional pattern: right-on-right or left-on-left.

A sacral torsion involves rotation of the sacrum around one of its oblique axes, so both sides rotate in the same direction. That pattern is described as right-on-right or left-on-left, which directly names the torsional rotation on a specific oblique axis. Nutation and counternutation, on the other hand, are tilts of the sacral base in the sagittal plane (anterior or posterior tilt), not a torsional rotation. Nutation with counternutation isn’t a standard torsion pattern either. So the best answer is the one that names a true torsional pattern: right-on-right or left-on-left.