That's an outstanding question, but I'm guessing there isn't much data on it.

The key to joint replacement is replacing worn, damaged or dissolved cartilage. There is currently no good replacement for human cartilage as it requires a blood supply.

I wish I knew more. However, if the underlying problem is caused by osteoarthritis, and that's usually the case, even replacing the cartilage would be temporary as the arthritis will just come back. I've had both knees replaced and the only thing I can't do are impact sports - running, basketball, and others. I'm gonna need a shoulder, maybe both replaced in the nest few years. Joint replacement is very advanced if you do the pre-has and post-has work.

All that said, I wouldn't wait for a stem cell answer. I'd get the replacement, ideally using the Mako robotic assistant.

Sorry, I don't think this helps you much. I can say that for the most part, joint replacement has reached a very advanced stage.