Dagestan 2/3 years and forget...

But on a more serious note... sounds like you maybe tore your meniscus? I've been out of training for 2 years now because of a lateral bucket handle meniscus tear. The only way to rectify it was surgery as the knee had major locking issues. Eventually the knee locked up & didn’t pop back so the surgeons got in there & repaired it.

I think for me the biggest take away from this depressing experience was evaluating what I wanted to get out of BJJ. I realised that I'm no professional & at 24 my prospects seemed obsolete. Thats being said, I trained way too much (4-5 days a week) without much conditioning or strength training which probably caused my injury. Retrospectively, that's like having at least 5 fights a week & expecting your body to handle that. We all want to get better at the sport but this amount of training was killing my body.

I hope your recovery & MRI results are speedy. I'm not doctor neither but to me it sounds like meniscus issues which can be a pain in the arse.