I fly VERY often.
99% of the time, I set off the metal detector. Some other people I've flown with who have implants do not. With that in mind, here's my routine:
Before getting in line for security:
1) Empty all pocket contents into your carry-on bags. This includes cell phones, keys, wallet, loose change, etc. Only carry your ID and boarding pass with you in your hands or pockets. WEAR your implant as normal.
2) After placing bags on the X-ray machines, once they go through, step through the metal detector. IF you set off the detector, notify the TSA person that you need to be wanded. They'll call for a screener of the same gender you are.
3) WATCH YOUR BAGS CLOSELY AT ALL TIMES. DO NOT LET THEM OUT OF YOUR SIGHT. FACE YOUR BAGS AS MUCH AS POSSIBLE. IF YOU'RE TRAVELING WITH SOMEONE, HAVE THEM HOLD YOUR BAGS FOR YOU.
4) The TSA person screening you will usually ask you which bags are yours and if no one is with you, they'll take them over to the security center near where you'll be wanded.
5) The TSA person will then proceed to wand you and hand pat you as necessary. When they're done, grab your bags and run!
That's it! You do NOT need to tell anyone else that you have an implant. The flight attendants, the pilots, they don't care. It's not gonna mess up the airplane if it's turned on during take off and landing.
Two more tips:
1) If you want to, tell the gate people that you're deaf and want to pre-board. The most common explanation I give is that I can't hear which group is boarding and it's better if I board first. They will absolutely take care of you.
They'll also tell you if your flight's delayed, and keep you up to date. Southwest is GREAT at this.
2) DO NOT PUT YOUR PROCESSOR THROUGH THE X-RAY MACHINE! Do NOT! If they insist, ask for a supervisor, because you do NOT want your programs to be erased!