Do Spreader Grafts Make the Nose Wider?

Spreader grafts are most commonly used to improve or maintain nasal breathing, and can be used to straighten a crooked nose

They will add bulk to the middle vault of the nose and can widen the dorsum. Given this the advantage of using them must out way the disadvantages. At this early stage though the widening will be due to swelling. Time and patience is what is needed.

Jeremy Hunt

It depends on how wide to dorsum was prior to dorsal hump reduction.  Patients with a wide dorsum (bridge) will have narrower noses following dorsal hump reduction, spreader graft placement and nasal bone narrowing via osteotomies.
Those patients with a narrow midportion of the bridge preoperatively will have a wider midportion of the nose after spreader graft placement, which would be aesthetically more appropriate and better functionally.
Patients with an average dorsal width of about 7 -12mm will usually have about the same width after surgery as before surgery.  It is possible for the width of the midnasal area to be slightly wider after surgery  if the nose is significantly deviated and additional spreader grafts are needed to keep the nose straight.
It is very important to note  that even 12 months after rhinoplasty there is  still a small amount of swelling that takes years to go away. So, the nose may initially appear wider and continue to narrow during the first several years.