The only difference is that instead of cutting yourself with a dirty razor, you're doing it in a sterile environment under general anaesthetic.

I'm pleased to learn they're manufactured to high standards in a sterile environment.

I remember only the dramatically sterile environment, the horrible grey lights.

We want to get away from having a sterile environment where you keep animals alive but it's boring for them.

But it does them absolutely no good to be in a sterile environment.