Will my nose be weaker after a Septoplasty? (photos)

This is an excellent question. Septoplasty performed properly should not significantly weaken your nose.  Techniques used to fix septal deviation should rely more on modification of cartilage rather than removal.  Many times, however,  there is excess cartilage causing deviation that can be safely removed.  I always put as much cartilage back between the septal membranes as possible during septoplasty.   I think this helps to preserve the integrity of the septum.  Based on your scan it appears the main issue is a bone spur which is quite far back in the nose.  This bone can be safely removed without issue usually leaving the cartilage in front of that region intact.   You should clarify all this with your surgeon.  

Hello. You definitely have symptomatic airway obstruction due to your deviated septum. A septoplasty is a safe operation to undergo, provided it is done by the right surgeon. It should not affect your breathing or nasal appearance. Good luck.

A well done septoplasty will not change the strength of the nose. Often, the only way to get a nice straight septum is to remove some bone and cartilage.  An experienced surgeon knows how much cartilage can be removed safely.  Don't worry, you should get a great result. Good luck.