De or het beenletsel?

The correct Dutch article is:

het beenletsel

Rule Words ending in -sel: usually het. See the rule

How to use beenletsel

the beenletselhet beenletsel
this beenletseldit beenletsel
that beenletseldat beenletsel
our beenletselons beenletsel
your beenletseljouw beenletsel
every beenletselelk beenletsel
which beenletsel?welk beenletsel?
a big beenletsel / the big beenletseleen groot beenletsel, het grote beenletsel