DUPUYTREN DISEASE?

Hi @gfgeoff, Welcome and I can imagine that you are quite concerned about this condition given your profession!!
First of all, this below is from my reading and experience as a T1D, not as professional advice or opinion:
I gather they have traced the genetics for the tendency to this condition back to the Vikings, and nothing to do with rowing with oars either !!
As a result of diabetes I have something similar but not exactly the same, called trigger fingers where one or more tendons in the palm of the hands swells up. The tendons are like smooth ropes which move when the muscles up in the forearm contract. To work properly these smooth ropes run through tissue loops in place of pulleys. When the swelling in my tendon moves it get stuck in the pulley then suddenly slip through causing my finger to suddenly move or trigger. Then it is difficult to get the finger unbent as the swelling gets stuck on the other side of the pulley and sometime has to be pulled back through with a great deal of pain in the process.
But also I have the start of some bending in one finger as the tendon will not allow it to go completely straight. This is more like the description of Dupuytren's as I read it.
So far I have had the offending tissue loops removed and at is well. The bent finger is only slight and does not worry me with sewing, tying knots, making and flying kites
I have a non-diabetic friend with Dupuytren's who is very good at drawing maps and calligraphy. He has had an operation to loosen up the contractures and so far so good. He is back to his calligraphy.
So there is hope !!
Best Wishes.

I had the same. Interestingly, or maybe not, I also play guitar, albeit very badly. My contracture was in my left hand, so not good for fretwork!
They tried cortisone injections into the hand, painful and ineffective on the whole. Then had an op; I can say that within a month my hand was perfect again. I could still play guitar just as before - i.e, very badly.