The difference between spreader graft and dorsal onlay graft?

A dorsal online graft is placed along the top of the bridge line. Spreader grafts are placed along the septum just underneath the upper lateral cartilages. For more information and many examples of spreader grafts, please see the link and the video below

Thanks for your question. This gets really technical, so bear with me. Spreader grafts go between your septum and your upper lateral cartilages. They will add a little bit of width to your nasal bridge and should improve breathing if you have any issues. Spreader grafts can be made out of septal cartilage or costal cartilage. An onlay graft will provide increased dorsal height. You can use a piece of cartilage as it is or some surgeons will dice it and wrap it in fascia. Tip grafts can be made out of ear cartilage or out of costal or septal cartilage; it depends on what you need. Ear cartilage won't give you structural support like the other sources will. For a patient who had all of these grafts using both ear and costal cartilage, check out the example from my website! Good luck!