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Yeah, that sounds familiar. When my RA is active, my knee locks when I try to straighten it and I can't get past a certain point. It also has crunching and popping feelings inside the knee - I can't tell you for sure what causes this (because it's Saturday and my brain has gone away, okay mostly because I'm not a doctor), but I suspect it's some sort of interaction between the fluid in your knee, the inflammation and tendons getting trapped in the tendon sheath because of the inflammation. It is definitely something to discuss what your rheumatologist. He may be able to drain the knee or give you a steroid shot in the knee, which should help for a while. Surgery may be an option, but again, I would suggest starting with your rheumatologists and going from there.