Dupuytren's Contracture. My mom has this now. It's an incredible pain in the ass hand injury that basically turns your ring and pinky fingers into the "Monkey's Paw" look.
As for treatment? There are some ways to correct it if you get at it. Early treatment can be steroid injections, needling of the tissue to break away the mass that builds up and pulls the fingers, injection of an enzyme called Collagenase that can actually sometimes eliminate the tissue build up in as little as 2 treatments. Ultimately, if all else fails, a surgeon can go in and cut away the build up but it's a slow recovery time
Very sorry to hear this and hopefully he explores one of these avenues. He touched on something alarming in that it's hereditary, affects males typically over 50 of northern European descent. Well, mom has it, I'm predominantly of Welsh and German descent and I'm 40 now. I've already had tons of tendon issues in my hands so this is something worth watching out for
www.virginiaradiation.com
My wife has Dupuytren's disease. She had radiation therapy done on it a few years ago, which did help. The procedure was done by one of the doctors who actually pioneered the treatment. It is fairly new so a lot of doctors are unaware of it.