I have a medical condition If I applied for a car licence in the USA what would happen?

I am currently in Australia but I intend on going to the USA later in life. my medical condition is cerebral palsy it affects my left arm and as a result in order for me to drive a car I must have a spinner knob. I know that I am certaintly capible however of driving without one. however in order to turn I have to use one arm to do so. something which is illegal in Australia. from what Im aware its not illegal in the USA but surprisingly the spinner knob is, unless for a medical condition which I have. in the US would I have to have a spinner knob just because of the disabilty or would they be willing to consider my abilty to drive without it.