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My finger lock as well.  One time, I opened a can of coke and my index finger just stuck in the down position.  Is that what you mean?  It happens randomly with one or more fingers.  It really scares me when it happens.  They eventually come unstuck but I have read that they can stay that way which really scares me.  I would think there is a surgery for it but have not really asked.  My rheumatologist told me the name for it when my fingers so that but she said it so quickly that I didn't understand or remember it.