I think I didn’t describe that very well
The snap is a repetitive little internal “click” that starts up either when I walk too much or completely randomly (like overnight). I used “snap” because it’s not something audible, which “click” implies. If I try to ignore it and walk around anyway, it gets more swollen and painful.
If I use PEMF on it at night or in the morning when it’s already swollen and clicking, it seems to get yet worse - more swollen and the clicking + swelling seems to last longer in terms of days than if I don’t use it. Without it, it seems to go down in a couple days, with it even once, it might last all week. When I’ve tried it during a good period, I seem to become swollen after use (though whether that’s the PEMF or just the end of a run of good days, who can say??).
BUT I have the impression that if I’m using the PEMF on my hands and hips (which don’t much generally), then I generally feel better even in my knees on the “good days” - like a distributed effect.
I just can’t seem to find a “safe zone” where the PEMF helps pain/swelling/function directly at the knees. I’ll try the IR to see if that could do it, but it will take a bit of time to arrive way up north here ;-).