Farr is one of my favorite actors. He spent eleven seasons entertaining us on MASH.
Jameel Joseph Farah was born into an Antiochian-Orthodox-following Lebanese family in Toledo, Ohio. His first film was Blackboard Jungle, where he played the mentally challenged student Santini. He appeared on several different television shows with bit parts and that’s actually how he was cast as Corporal Klinger – he played a character in one episode and the producers liked him so much that they kept him on. He went on to star in AfterMASH and in Cannonball Run and its sequel.
Farr was diagnosed with Rheumatoid Arthritis in his hands in the early 1990s. This hasn’t slowed him down, though instead of acting these days, he focuses mainly on charity work. In 1984, he helped start up the Jamie Farr Owens Corning Classic, which has donated millions of dollars to charities.
In just his hands?
To tell you the truth, I'm unsure. The only info I could find was that it was only in his hands, but this does seem unlikely.
I read he has been in a wheelchair for a while due to arthritis throughout his body.