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Because it comes and goes, it makes me wonder if you don't have a cartilage tear. Sometimes with a "bucket handle" tear of the meniscus, the tear can flop into the knee joint space (giving you extreme pain and difficulty fully flexing the knee) and a step or two later can flop out of the joint space leaving you nearly pain free. I had this exact same condition years ago, and what was the tipoff to me was when you said, "when you really need to pop a knuckle but can't."
To be honest, I'd stay off of it if I were you until you get it looked at.
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