What trauma would be induced from #4?

What trauma would be induced from #4?

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

Answer: (C)

A key idea here is that cranial strains reflect how the sphenoid and occiput move together under trauma. Sidebending-rotation strains involve a combination of bending to one side and rotation about an oblique axis. When the pattern is described as a right sidebending rotation, the motion couples in such a way that, in the standard framework, the associated lateral component is toward the left. In other words, the trauma that produces this right sidebending rotation pattern manifests as a left lateral strain in the cranial pattern description. So, the most fitting description of the trauma is a left lateral strain, rather than an inferior vertical strain (which would be a vertical, not lateral, displacement), a right lateral strain (same side as the right sidebend, not the pattern described), or the pattern itself (right sidebending rotation) being the trauma rather than its lateral component.

A key idea here is that cranial strains reflect how the sphenoid and occiput move together under trauma. Sidebending-rotation strains involve a combination of bending to one side and rotation about an oblique axis. When the pattern is described as a right sidebending rotation, the motion couples in such a way that, in the standard framework, the associated lateral component is toward the left. In other words, the trauma that produces this right sidebending rotation pattern manifests as a left lateral strain in the cranial pattern description.

So, the most fitting description of the trauma is a left lateral strain, rather than an inferior vertical strain (which would be a vertical, not lateral, displacement), a right lateral strain (same side as the right sidebend, not the pattern described), or the pattern itself (right sidebending rotation) being the trauma rather than its lateral component.