Hi,
It might have just been me, but my personal statement was brought up at least once at each of my interviews. I believe it was a conversation starter because I had written about my orthopedic experience in another country. Usually good things came from that beginning and they would ask me how orthopedics was practiced there, what types of different cases I had seen, and that they had thought about visiting there before. But like I said, this could just be my isolated experience. It wouldn't hurt to have some sort of "hook" in your statement though that people can talk about . . . i.e. don't make it bland and cookie-cutter.
However, that was just at the interview . . . like everyone else says, its going to be numbers that get you past that first hurdle of being invited to interview.