Looks like there are a lot of us with metal parts
I had 2 screws and a bolt in my ankle (removed now) and still have a 7" metal plate in my leg. Initially I set off the WTMD 100% of the time; after the 2 screws and bolt were removed it was 50% of the time. Now it seems I rarely set off the WTMD. However, when I do, I immediately advise the screener that I have a plate in my right leg.
The metal plate does react to the hand held metal detector and the screener just pats down the area. I tell them in advance that the scar area is sensitive.
Initially I carried a doctor's note, but no screener seemed interested in it because it's something easily forged. I also carried a printout of my x-ray just to gross out any screener who was giving me a hard time.