Hair follicle transection
Transection of the hair follicle causes irreversible damage to the hair in many cases. Depending on the location of where the transection occurred, the hair may or may not grow again.
If the transection occurs above the hair bulge area (hair stem-cell producing area), the hair may in fact grow again. Transections lower than that usually cause irreversible damage to the hair.
This results in total disruption of the communication between the stem cells and dermal papilla.
Why the graft transection is especially high with Afro hair?
On the picture below you can see why straight hair is the easiest to extract with a punching device used during FUE hair transplants and why Afro hair is the most challenging to extract without damaging it.