Different airports re-act differently we've found.
I have an 11" rod in my back, connected to my spine with wing nuts. I've never set off a metal detector yet since 1978.
My 73 yr old mom, however, had a triple bybass. She has some wires in breast bone. She set off the one at Providence (only 1 yr - not the next year.) Couldn't believe the questionning she had to go thru. She's this little old 5 ft lady & easily confused. She was so frazzled.
Both of us never had any problems in Orlando. We always assume I'll be the one stopped since I have WAY more metal than her.
I have carried a dr's note since 1978. However, we have BEAUTIFUL scars if they want to see.
ETA: My boss has some pins in ribs...and she's set off some traveling internationally.