In the wake of having multiple surgeries myself, I became interested in watching procedures like the one in the article actually being performed. For example: https://www.youtube.com/watch?v=DQfRKTKmq80 (warning: may be disturbing).
I don't consider myself squeamish, but just try finishing a video of, say, knee-replacement surgery. Imagine carpentry, with someone's living bone. Yikes.
Massive respect for the people who successfully do this every day without being completely overwhelmed by the complexity, the high stakes, and, especially, the cringe-inducing gore.