Just had my first knee injury ever. I twisted my knee while side stepping. I only had my own weight on my leg but it just collapsed out under me, bending sideways slightly.
There was a doctor at the Dojo who determined that it might have been a minor dislocation. We iced it immediately at the Dojo. I'm still able to move my toes and ankle without pain and after two days of RICE, I've regained some range of motion. Hopefully it's not a tear, I'm going to visit my GP today or tomorrow to get a diagnosis. I'm already wearing a knee brace in the meantime and continuing RICE in bed all day.
(Website by Marc MacYoung, not me)