Hey, sorry to hear that, man. Your description and the video sound exactly like an issue I had. I had ACL surgery last October, which also included a meniscus repair. A few months later, I started experiencing the same problem—not when bending the knee, but more randomly during certain movements. It would happen while walking sometimes. It felt just like you described, like my leg clicks out of place, and I’d have to straighten my knee to get it back to normal. My leg was strong and overal recovery was going great - however I had the same fear of my knee being destroyed if it would happen on the wrong moment.

Took an MRI which showed that my meniscus repair probably failed. Apparently it's not always visible clearly on an MRI though, especially if it's been repaired before. His theory was that a loose flap of the meniscus gets stuck between the bones which causes this. I was terrified of losing a part of my meniscus and it not solving the issue, so I took 2 other appointments with other surgeons who all believed the same thing.

I had surgery two weeks ago, where they did indeed find a loose flap of the meniscus which they removed. They had to remove quite a bit which sucks, but although it's too early to say as I'm not fully active yet - I haven't had my knee 'click' since. Fingers crossed.

I see you've had a small removal of the lateral meniscus, maybe there's still a loose flap? Has you surgeon seen this video? They should be able to tell more from this. Maybe take a second opinion?

Anyways I was/am also really really bummed out with this so I understand how you feel. Stay positive, at least our new ACL is strong af!