Dear all,

Just thought you might be able to help me understand the ASIA classifications. I saw you put the list up in Ian's thread, and I remembered a question I had about it.

I understand that for ASIA A, rectal sensation is the key determining factor.

But what I don't get is how the lack of rectal sensation can imply things about the entire cord below the level of injury.

The way I see it is that messages travel down the cord, and when they get to where they're going, they stop.

I would think that if messages are getting to, say, L5, wouldn't you be better off testing for sensation/movement near that area than at the very bottom of the cord?

How does testing for sensation/movement at the lowest section of the cord imply that no messages are getting below the level of injury?

Maybe I'm missing something.