Correct. Most likely because your surgeon elected to maintain your MPA and so maintain it as to give you a streamline mandibular border which is a good thing.
Your MPA angle is well within the norm; approx 26 deg. in both before and after. So, it doesn't look like your MPA angle decreased with the CCW-r to the maxilla. However what the CCW-r, based on the rotation of a triangle, does is allow for the BSSO aspect of the surgery to the mandible to go out further than it otherwise would go if not for the CCW-r. Now, IF your surgeon felt that it was needed to REDUCE your MPA (mandibular plane angle), which is done by kind of twisting the BSSO segment CCW-r, that could have been done too. Thing is that when they elect to do a CCW-r 'twist' directly to the mandible, it leaves part of it sticking out below and between the posterior and anterior mandible. In your case, it looks like you got a 'streamline' lower border of the mandible. Like no extra part sticking out lower between the posterior and anterior mandible. So, that is a GOOD thing in your case because your MPA was within the norm and didn't need to be reduced. The anterior open bite that arose from the posterior downgraft to the maxilla could be closed later down the line with devices to do that.
