How do you write spinal vertebrae?

Would you write , He was a C5 quad and could no longer walk.

or

He was a C-5 quad and could no longer walk.

also....

He had problems with his C3 - C5 vertebrae.

or

He had problems ith his C-3 through C-5 vertebrae.

Thanks!!

FYI I've seen it both ways on the internet, so I was just wondering what you all would do.

I do it C1-C2, C3-C4, C4-C5, etc. 

Do NOT do it C-4, especially if you're doing a Workers' Compensation deposition, because C-4 and C-3 indicates forms that doctors use for patient care.

He had problems with his C3 through C5 vertebrae.  I do it that way if the doctor says "through".  I use the hyphen if the doctor says C3 dash C5, and then I would write it:  He had problems with his C3-C5 vertebrae.

More specifically..

When they indicate L1 through 2, you write it that way.

If they say L1-2 level without indicating a word such at "to" or "through," then you write L1-2.

If they say at the 1-2 level without indicating words, then 1-2.

MRIs designate the levels by L1-L2 with hyphens, but of course whatever the doctors say is what's put in the record :-)