Just looked up Force Arthritis on Wookieepedia, was surprised.
It’s absence stunned me, too.
They have an article about General Arthritis (the disease not the Separatist leader) as seen from a Star Wars context : http://starwars.wikia.com/wiki/Arthritis so they haven’t entirely dropped the ball on this one. I look forward to when they just edit Wikipedia and Star Warsify it.