Maybe you should take a look at the Russian artist Alexej von Jawlenskij
(1867/Twer - 1941/Wiesbaden), but I'm not sure about the specifics of
his illness. The last years he was not able to handle the brush,
therefore he bound it up.

Dr. Gora Jain, Hamburg, Germany
Jain-Horlitzt-online.de

The most notable example I can think of is Auguste Renoir. Eventually,
his hands became so crippled by the arthritis that he had to have the
brush tied between his fingers. (A few interesting references to it can
be found in his biography, written by Jean Renoir.)

Best regards,

Vesna Velkovrh Bukilica, Ljubljana, Slovenia
vesna.velkovrh-bukilicaguest.arnes.si