Learn Finnish: Potilas kuntoutuu onnettomuuden jälkeen. - The patient rehabilitates after the accident.

Yes! While kuntoutua uses the reflexive suffix -utua rather than -ntua, they share the exact same inchoative function: expressing a change of state. It comes from the noun kunto (condition) and means getting into condition or recovering. Interestingly, there is a parallel verb kuntoontua which does use the -ntua suffix and means the exact same thing!

What is the difference between kuntoutua and kuntouttaa?

Kuntoutua is an intransitive verb where the change happens to the subject automatically: the patient is recovering on their own. Kuntouttaa is the transitive equivalent meaning to rehabilitate someone else. If a doctor were doing the work, you would say Lääkäri kuntouttaa potilasta (The doctor rehabilitates the patient).

Why is the word for accident in the form onnettomuuden instead of its base form onnettomuus?

The word jälkeen (after) is a postposition, and the word preceding a postposition almost always takes the genitive case. As a quick refresher, remember that nouns ending in -us (like onnettomuus) change their stem to -uude- before adding the genitive -n.

Could Potilas kuntoutuu also mean that the patient will rehabilitate in the future?