Uhh, hate to break it to ya, but even with insurance its not all roses and sunshine in the USA, you can easily go 6 months waiting for a knee replacement here. Watched a family member go through 4 over the past decade, and its a slow process no matter the insurance provider.
Plus, hospitals here on the West Coast have amped up doing a bunch of skeezy stuff recently, you could easily end up with a non-functional leg at a place like Swedish or Providence (two major hospital systems):
https://projects.seattletimes.com/2017/quantity-of-care/hosp...