Need visa to get limb lengthening in United States?

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If you are from Canada and want to get LL done in USA, do you need anything to get across the border to do it?  Of course I have my passport and travel to the USA very often from Canada, but never for a surgery.  To work in the USA and you are a Canadian you need a work visa so I was wondering if you need anything to get surgery in USA.  You can stay in the states for 182 days as a Canadian.

I am staying in Florida (west palm beach) for 3 months (90 days) starting October 18 (surgery date) and wanted to know if I need anytbing or need to lie to the airport agent who ask me why I’m going to Florida.  Is there anyone who is Canadian on this forum that went to the USA to get this surgery.  What did you say to the airport to get on the plane? Did you need anything?  I just don’t want To be turned around and not allowed on the plane.

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I just don’t want to get turned away at the border.
When anyone here traveled to a different country to get the surgery what did you say to the airport when trying to get past security?  Did you tell them you’re doing the surgery?  If not, what did you say?  Did you tell them you’re actually doing Limb lengthenjng or another surgery?  What we’re there reactions?  Did you get harassed at the border?