If they set off metal detectors at the airport they will probably set them off at the ship. You may have to be "wanded". This means a handheld wand will be waved over your body and it is possible you could be patted but not to intensely.
Let them know before hand that you have the metal in you before you go through the detectors.
I think Jim our Community Staff Leader would be a great one to answer this question. He has a lot of metal in him.
Take care and I wouldn't worry too much about it, even I've been pulled out and given the thorough search at the airport checkpoints. It isn't bad.