Subtle changes like that are hard to get right, I don't usually use that word in English and in dutch it is 'gehandicapte', and I translated that literally.
I sympathize with 'ars' though, whatever you call it the truth is someone has a body with bits and pieces not working the way the rest of us have.
What always bothered me about this, is when a dog loses a leg, the dog instantly transforms into a three legged dog, still competes with his litter mates as though nothing has changed, no special allowances given, none expected. It's literally just another dog. We humans seem to continuously compare the people around us with the 'norm' and we like to label those that are visibly different in a negative way, and those that are visibly different like to draw attention to that fact in demanding we level out the differences.