Was it rude to ask this question?

I was in outpatient PT today and the therapist was working hard with someone who had obviously been going there a long time. The woman could barely walk and was using two canes to get around. At the end of the hour, we were sitting near each other and I asked the woman if she had had a stroke. She said she had Cerebral Palsy.

She didn’t seem offended and I would not have a problem with someone asking what had happened to me but I am left wondering if it was rude to ask.