Kamen is some kind of whiz all right. They didn't say how people control the arm, I know electrodes in the brain are still in the experiments on monkeys category so that can't be it. They say scar tissue gradually impairs the function of that.

I saw a bit on 60 Minutes (I think) where some guy who was a double amputee, IIRC, at any rate, no use of legs, used one for just about everything. The guy got enormous grief from yay-hoos who just assumed he was too lazy to walk.

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1986 300SDL, 362K
1984 300D, 138K