andyjeffries
Senior Master
As a mate used to say to me "big guys still have knees", referring to the fact that even a poorly timed, untrained kick to someone's knee will still usually result in a full knee reconstruction
Really? I've seen a lot of people get kicked to the knee in MMA and often they are fine afterwards (i.e. no visible issue). These aren't poorly timed, untrained kicks - but those delivered by professional fighters (and often to "big guys").
Anderson Silva often does it. Jon "Bones" Jones does it. Lyoto Machida started doing it back to Jones. A lot of fighters do it when they're on their back and their opponent is standing over them.
There are moves people can claim are dangerous/life threatening/serious/whatever, but quite a few moves are actually tested full contact against big/strong guys in the MMA rings so we can put the debate about them to bed. Knee kicks - unless they happen to be to an unexpecting opponent - aren't always going to result in serious damage.