I spent several years stationed in Yuma, AZ, and a lot of people would come to Yuma to do just that. They can't afford a procedure in the US, or they're waitlisted to oblivion in Canada, so they fly into Yuma, take a shuttle across the border, and have it done in Algodones.

As always, you need to be smart, but people are willing to take the risk of complications if it means the difference between a modest expense and facing a medical bankruptcy.

The same thing applies with dental work. All of my wife's root canals were done in Mexico.