I have a Titan installed in my middle finger. I went and got an MRI done. It was totally fine. There wasn’t even much pain as long as you weren’t waving your hand around. I didn’t even need a tight bandage or anything. Just stay still and stay calm.
My measurements (while not perfect) indicate no loss in field strength after being exposed to the 1.5 Tesla field for 35 minutes. Some MRI are 3 Tesla, but it’s a linearly scaling unit of measurement, so I’m confident that even double the field strength would have no chance of tearing the magnet out of my finger. MRI above 3 Tesla are mostly for research purposes, so you shouldn’t encounter them in a healthcare situation. Personally I would even be willing to go in one of those, but YMMV.