There is an Ikkyu in our dojo who suffers from the effects of *severe* back trauma, has no feeling below her knees, and also trains with a pacemaker. She spends 90-95% of her time in a wheelchair when she isn't training.
She will be testing for her shodan in November.
Since she is able to operate independent of her wheelchair during training, the only real accomodation the dojo makes for her is to respect her need to sit out from time to time, or opt out of certain ukemi.
Other than that, we just try to keep up with her.
Hope that's helpful.