De or het psychotraumatologie?

The correct Dutch article is:

de psychotraumatologie

Rule Words ending in -logie: always de. See the rule

How to use psychotraumatologie

the psychotraumatologiede psychotraumatologie
this psychotraumatologiedeze psychotraumatologie
that psychotraumatologiedie psychotraumatologie
our psychotraumatologieonze psychotraumatologie
your psychotraumatologiejouw psychotraumatologie
every psychotraumatologieelke psychotraumatologie
which psychotraumatologie?welke psychotraumatologie?
a big psychotraumatologie / the big psychotraumatologieeen grote psychotraumatologie, de grote psychotraumatologie