Implanted metal rarely sets off metal detectors, I believe. A few family members have metal from surgeries (my mom has screws and wires in her feet, and my uncle has a titanium plate in his head). They haven’t ever had issues.
I honestly wouldn’t worry about it. If it did ever set it off, just tell them. They’d probably search you and maybe x-ray you, but they wouldn’t find anything they could hold you back for.