Making characters strike poses when hit?

Is it possible to get your character to do a certain pose when hit? For example if you shot a character in the knee, would it be possible to have that character grab their knee while still being affected by physics (i.e they fall over and their limps still interact with the surroundings)? I tried with animations but it doesn’t work because the character don’t fall and his limps aren’t affected by physics. Any way to do this?

Yes, if you combine Final IK with AnimFollow.

only way i can think to do this is add a collider to the knee and when it gets hit to play the animation to grab the leg.