The number of grafts is determined by the size of the area to cover. As well as any remaining native hair. Along with the quality of the natural hair characteristics. Comparing hair transplant results do not simply assume you will need the same. There are many variants to take into consideration.
For example. The position of the hairline will increase or reduce the surface area to be treated. The larger the area more hair is required to cover it. Eating into the hair bank, the finite resource to treat future hair loss.
Hair characteristics can range from hair colour, calibre or diameter of the hair. Fine or thick hair, if the hair is curly or straight. The contrast between hair colour and skin complexion. All these aspects carry an important role for the doctor. Aspects they consider when planning your hair transplant procedure.
The medical and artistic skill of making the slits or placement recipient sites will help in allowing each hair to maximise the coverage it can give whilst ensure a natural looking hair density is maintained.
The hairline is the first area to be placed; a “jagged” or irregular edge approximately three rows and just 2-3mm in depth are made with a thin surgical instrument able to make a small angled incision for the graft to be placed in.
The best hairlines
Great care should be taken when designing the hairline. It is an area that is not easily changed in the future. The hairline has the highest density of placement per cm2 of FU due to the single hairs and the need to give definition to the hairline without it being too see-through. Behind the single hairs the larger groupings are placed; in smaller procedures maybe only 1, 2 and sometimes 3 hair units are required whereas larger hair loss stages all hair groupings will be needed in the restoration. Two-hair units are placed directly behind the single hairs, followed by the three and four-hair follicles while ensuring correct angulation, direction and orientation are maintained.
Minor hairline reconstruction can be anything from 500 to 1500 follicular units with more advanced thinning over the frontal area requiring 2500-3000 follicular units. Progressive hair loss in the region of a Norwood V hair loss stage can require 5000 plus grafts and if the crown has dropped further it may require in excess of 7000 grafts.