How do you name SBS torsion dysfunction?

How do you name SBS torsion dysfunction?

• A. By the superior greater wing of sphenoid (e.g If right wing is superior --> right torsion)
• B. By the inferior greater wing of sphenoid
• C. By the occipital squama orientation
• D. By the combined rotation of sphenoid and occiput

Answer: (A)

The main idea is that SBS torsion is named by which side of the sphenoid’s greater wing sits higher at the skull base. In a torsion, the sphenoid and occiput rotate in opposite directions around an anteroposterior axis through the SBS, and the side with the higher greater wing of the sphenoid defines the torsion direction. So if the right greater wing is superior, we call it right torsion. This naming convention directly reflects the spatial relationship of the sphenoid to the occiput at the SBS, which is what clinicians use to communicate the dysfunction. The other concepts are not used for naming torsion: using the inferior wing would not correspond to the standard landmark used to name the torsion, and the orientation of the occipital squama or the idea of a combined rotation describes the mechanism or other strain patterns but not how torsion is labeled.

The main idea is that SBS torsion is named by which side of the sphenoid’s greater wing sits higher at the skull base. In a torsion, the sphenoid and occiput rotate in opposite directions around an anteroposterior axis through the SBS, and the side with the higher greater wing of the sphenoid defines the torsion direction. So if the right greater wing is superior, we call it right torsion. This naming convention directly reflects the spatial relationship of the sphenoid to the occiput at the SBS, which is what clinicians use to communicate the dysfunction.

The other concepts are not used for naming torsion: using the inferior wing would not correspond to the standard landmark used to name the torsion, and the orientation of the occipital squama or the idea of a combined rotation describes the mechanism or other strain patterns but not how torsion is labeled.