I actually have this happen to me all the time. I don't connect it to lyme at all. My hip pops out of joint and I have to walk funny to pop it back in, but it doesn't hurt and other than having it happen every now and again, I don't pay much attention to it.
I would say it is just something that happens and isn't lyme related. I never had any joint problems with my lyme. I wouldn't worry too much about it unless it gets worse.