I have walked through the metal detector with all metal removed (except for the implant) and they directed me aside for wanding and a pat-down. They know you have a hip implant, since they asked if I had a hip implant. They must see it on the screen. A fellow skier followed me with both knees replaced with metal implants and he was directed aside also. I showed the card once and they didn't even look at it. They ask if you want a private pat-down. They assign an agent of the same sex to do the pat-down. I have been screened at Newark, Seattle, Juneau, Anchorage and Fairbanks, so far. Taking all metal off, such as jewelry, watches and belts saves time during the wanding process. They even wanded the staple on my boarding pass in my shirt pocket.
To speed up the process, we need a card ID with a photo of the person and serial number of the implant that matches the serial number on the implant that is legible on the security screen.