Today we left for the vacation. I felt I was prepared for the security at the airport and told them BEFORE I went through security that I had a knee replacement. The security agent told me to go through the security screening machine and of course it went off. He then summoned over another agent (female) who proceeded to take me to the pat-down area. I was happy that she took all of my personal items once they went through the scanner with her. I wasn't allowed to touch them. She then informed me that she needed to do a complete body pat-down. (Showing her my red scar meant nothing) After she explained to me what she was going to do she proceeded. It was very embarrassing as she was quite thorough to say the least. Before she let me go she said she had to check her gloves for explosive powder. She was not happy when I told her that my knee was NOT going to blow up. I know she was just doing her job, but geez, they treated me like a terrorist. Just this week someone got on a plane with fake boarding passes and was able to fly all the way to LAX before they caught him....go figure.