Later on when it swelled up I think I would have been around a 5, maaaaaybe a 6: I started having spasms in my arm and it hurt enough that I had to stop and stand still until the spasm passed, I couldn't talk or focus or do ANYTHING while my arm was hurting. But I didn't scream or anything. (Btw, in case anyone REALLY WANTED TO KNOW, my, er, monthly cramps are about this bad, maybe a little bit worse. So yeah, my broken arm? Whatevs. And doctors wonder why I keep flushing the pain meds they've prescribed me after surgery/injuries in the past.)
I think one of the doctor posters on MDOD described what 10 out of 10 pain looks like the best: having your leg amputated with a hacksaw. In my mind, 10 out of 10 pain is what you experience just before you pass out. So I'm not really sure why they even ASK you to rate your pain this way. The doctor should really preface it with "well, you're not passed out or grunting and covered in sweat, so I'm going to say your pain is less than a seven. Why don't you rate it for me on a scale of one to six, seven being the part where you're grunting and sweating from the effort of not screaming." Because when you're at or above a seven, they ain't getting any useful communication out of you and they ought to know that.