The traveling article posted has some great information! I'm a flight attendant and deal with these things daily.
It is correct they do not care in security if you show them a card that you have had an implant. It makes no difference and you still have to go through full security.
But - do request the body scanner if available! Do not just go through the metal detector and then afterwards when you beep tell them you have a metal implant. Once you beep they are required to do a full pat down check and those are not fun. But if you go through the body scanner it shows where the metal is in your body and they just check that area. Much easier.
Bulkhead rows on all aircraft do not necessarily have more leg room. Sometimes you can't even stretch your leg out fully in front of you. It depends on the aircraft type and there is also no place to put your personal belongs there, they all have to be put up in the overhead. So keep that in mind. And exit row seats are for people who have no disability and can assist fully in an emergency evacuation. They will specifically ask you that question if you are seated there. So please be honest and let them know if you can't physically help. We depend on our exit row people to help us out in an emergency
One more thing about seating, if you book an aisle seat expecting to be able to stick your leg out into the aisle please think that one through. The aisles on aircraft these days are very narrow and are very busy and constantly have crew members and other passengers walking up and down them. Very large and heavy carts are used and we can't always see ahead of them no matter how careful we are. I can't tell you the number of legs, feet, bags and straps I have tripped on over the years. It's very dangerous for everyone to have anything sticking out in the aisle. I see people come on all the time in wheelchairs and then see them stick their bad leg out in the aisle and I just know it's a disaster waiting to happen.
The wheelchair assistance is great - but do be prepared to wait! If you have to change flights enroute book enough time in between the flights. Better to have too much time to transfer than not enough. You can always get a bite to eat if you have to wait.
Don't hesitate to ask the flight attendants on board for ice! We are always happy to fill up ice bags for you throughout the flight. We want you to be comfortable!