Hi @Raphael84, thanks for your reply.
I'm 31 and some surgeons tell me I should only use 350 grafts to fill that area (which seems way too low). I've also had others tell me 1500 more grafts.
If I measure the bald area, the yellow drawn banana shape (in picture 2) is approx. 8cm x 3cm = 24cm2 | 24cm2 x 20 grafts = 480 grafts. Then adding more density to the right side 'triangle' shaped yellow area above the banana shape is 3cm base & 5cm height = 7.5cm2 | 7.5cm2 x 10 grafts = 75 grafts. Next to that is a small rectangle area, which may or may not need an extra 10cm2 grafts added for density but let's not include that for now.
480 + 75 = 555 grafts in total for hair transplant #2 to bring my total crown and vertex area to 20 grafts cm2 with full area coverage.
20 grafts per cm2 is technically classified as 'low density', but as long as my hair is no shorter than a 3 blade the hairs should group together when I brush (since there would be full coverage) to cover the area to a fair cosmetic extent.
I understand that 40 grafts per cm2 would give me the same visual density coverage as the front, but keeping in mind my age and the fact that I've already used 2000 grafts, I think the 20cm2 density (with artistic angling and placement by the surgeon) will at least get rid of the major bald patch people see when I'm sitting down and they look at the back of my head.
I have come across these photos from Dr. Wong's patient results page on this forum. 846 FUE grafts he used to get an exceptionally good cosmetic result in my opinion. And considering I don't need to fill to the same length as this patient (who goes further up towards the top of his head) as well as the fact I already have grafts in that area from hair transplant #1, it seems fair to me that 555 grafts should work?