I'm due to write a pretty lengthy text about the rehabilitation process of a disabled person, and I'd like to avoid repeating complex constructions such as "person undergoing rehabilitation". If I understood correctly, both "rehabilitee" and "rehabilitant" may have been used at some point, and they could be acceptable to me, but as a non-native speaker of English, both options seem somewhat "translationese" to me. Can anyone verify if either of these is actually used in health care or if there are other terms that I've missed completely?
The most idiomatic and common term would probably be patient. Or if you need something more specific, rehab patient. For example:
“In the Wii system, because it's kind of a game format, it does create this kind of inner competitiveness. Even though you may be boxing or playing tennis against some figure on the screen, it's amazing how many of our patients want to beat their opponent," said Osborn of Southern Illinois Healthcare, which includes the hospital in Herrin. The hospital, about 100 miles southeast of St. Louis, bought a Wii system for rehab patients late last year.
How about 'convalescent'?
someone who is getting better after a serious illness or injury
Or used adjectivally:
"For some months I had been ill in health, but was now convalescent, and, with returning strength, found myself in one of those happy moods [..]"
- E. A. Poe, The Man of the Crowd