What trauma would be induced from #1?

• A. Left torsion
• B. Right torsion
• C. Inferior vertical strain
• D. Left lateral strain

Answer: (A)

Cranial torsion is a twisting pattern of the cranial base where the sphenoid and occiput rotate in opposite directions around the anterior-posterior axis. When a twist injury is directed to the left, the sphenoid tends to rotate to the left while the occiput rotates to the right, producing what clinicians call a left torsion. In the scenario implied by the diagram or description labeled as #1, the pattern described matches this leftward twisting of the cranial bones—palpation would show the sphenoid rotated left relative to the occiput, with the opposite rotation occurring at the occiput. This distinguishes it from vertical strains, where the bones move along a vertical axis without opposite rotations, and from lateral strains, where a lateral shift pattern with different axis involvement is seen. So the trauma most consistent with the described pattern is a left torsion.