I've recently been diagnosed with Rheumatoid Arthritis, and my grip is VERY poor. I can't even make a fist anymore. A few days ago I found that cutting up a left-over, cooked chicken breast was VERY difficult. Not only the knife grip, but using my left hand to hold the meat with a fork was probably worse than the knife int the right hand.
I've seen sites mention those rocking knives and tools with wide handle. I'm more interested in wide-handled tools as the rocking knives look like they would be unable to be honed.