It's quite normal in a case like this. The vertebra must be pressing on the nerve ending. It all connects up.

6 seconds sound clip from the The Fortune Cookie (1966) movie soundboard.

You can hear this line at 00:25:32 in the Blu-ray version of the movie.

Quote context

[...]

- Could I have that cigarette?

- Cigarette? Is it all right if he smokes?

- Personally I gave it up, but if you gotta smoke, blow a little bit my way, eh?

- Why are you holding the cigarette like that?

- The other fingers are sort of numb.

- Numb? Did you say numb?

- You heard him.

- I don't understand. If he hurt his back, what's that got to do with the fingers?

- It's quite normal in a case like this. The vertebra must be pressing on the nerve ending. It all connects up.

- Is that a fact?

- It's like a watch that's been run over by a locomotive. Imagine what happens to the springs, the wheels, the balance.

- I guess I'm lucky I'm still ticking.

- Tell me when this feels sharp and when this feels dull.

[...]