Wavy, curly and even straight hairs all have a curvature to the hair shaft, the direction the hair lays as it exits the head. This is not to be confused with the angle or orientation of the hair of the hair. The hair shaft will always fall in a certain direction, be it up or down with all the surrounding hair laying in the same direction; this ensures with short or long hair there are no misdirected hairs.
This can be easily demonstrated by holding out a blade of grass and watching the curvature of the blade.
This fact can be used to great effect when planning a hair transplant and placing the follicular units in the recipient sites.
Normally, when the hair is extracted from the donor area the hair is shaved close to the scalp, but if a few mm´s of length are left on the hair shaft it is possible to detect the curvature of the hair shaft. This is easier to employ with the FUT technique than FUE as most doctors prefer to totally shave the hair when punching and extracting with the FUE technique.
When the follicular units are ready for placement each graft is taken and with the aid of magnifying loupes placed into the recipient site. This is pain staking work and nothing to do with the way the recipient site (direction /angle) has been made, it is solely down to the technician checking each placement as it is made and adjusting accordingly which way the hair curvature falls.
Watching the natural curvature ensures maximum coverage from each hair, allowing the hair to blend with the native hair more effectively; even with a shorter cut the curvature does not contradict the surrounding hair.Most hair will lay, fall or curve down towards the scalp, this increases the coverage each hair can give and creates a longer shadow over the scalp; the longer the shadow will block more light reflection off the scalp.
The more shadow that can be created will help to increase the fullness and appearance of density over the area treated.
Controlling the curvature has three major benefits:
It will blend naturally with the surrounding hair and not give the appearance of misdirected hairs
It will allow each hair to give greater coverage allowing with fewer grafts to cover a larger surface area, better donor hair management
Ensure more fullness or density can be achieved as the hairs are laying in a uniform pattern
Controlling the hair curvature can greatly enhance a hair transplant result, in respect of donor hair management and natural appearance of the hair blending with the surrounding hair