This an old thread, but the only one that I could find that related to my search.

I'm having back surgery in a couple of weeks, which will include the install of a couple of titanium pins. My surgeon claims that its rare for the pins to be detected when going through security.

So with that in mind, can anyone comment on frequency of detection? I'm also part of PreCheck, I would hate to loose out on the benefits of this for future travel.