The rules that I was able to find were very general. The UFC has a rule about unsportsman like conduct, which could be anything.
There's rules against groin kicks but not against tiger clawing the groin. So is diger clawing the groin illegal or unsportsmanlike.
If someone does a high kick and I side kick into their standing leg, depending on how that standing leg's knee is turned I can easily tear up the ligaments in that knee causing someone's career to end. So is that illegal or unsportsman like? Since kicks to the knees are allowed in some MMA venues. Some MMA organizations ban knee kicks all together.
What I want to know specifically is, Do the rules allow the defender to strike the knee of a standing leg of a kicker. So if someone is standing one leg, can I just start doing side kicks into the knee.
So instead of kicking the groin. Can I target the knee of the standing leg. Or would that be unsportsman like in their books?