A few years ago, a Dutch guy addressed this issue to Dr. Gho and posted Dr. Gho's answer ...
Anyway, Dr. Gho mentioned that the exact cause of the phenomenon
"shock fall out" isn't known - and not well described anywhere in the medical literature.
Here is my THEORY ...

Source: http://youtu.be/h_KYKp0EyoI
All hair follicles are connected among each other in a NETWORK-like pattern. As soon as this network is interrupted in big parts (due to cutting out of follicular units including skin parts via FUE - not via HST because Dr. Gho extracts just follicle tissue!!) - this can cause "shock-fall-out" of all the other hairs in this area.
By the way - also with HST, it can take up to 1 year until this NETWORK (see pic d.) is properly working again - in the donor area, as well as in the recipient area, where such a new network must form completely new (contrary to the donor site) and from scratch, so to speak, especially in former completely bald areas, as in gc's case.
This also explains, why hair transplants, in general, don't work as good in such scalps (no follicles for a very long time) as in still "virgin" balding areas.
Anyway, Dr. Gho mentioned that the exact cause of the phenomenon
"shock fall out" isn't known - and not well described anywhere in the medical literature.
Here is my THEORY ...
Source: http://youtu.be/h_KYKp0EyoI
All hair follicles are connected among each other in a NETWORK-like pattern. As soon as this network is interrupted in big parts (due to cutting out of follicular units including skin parts via FUE - not via HST because Dr. Gho extracts just follicle tissue!!) - this can cause "shock-fall-out" of all the other hairs in this area.
By the way - also with HST, it can take up to 1 year until this NETWORK (see pic d.) is properly working again - in the donor area, as well as in the recipient area, where such a new network must form completely new (contrary to the donor site) and from scratch, so to speak, especially in former completely bald areas, as in gc's case.
This also explains, why hair transplants, in general, don't work as good in such scalps (no follicles for a very long time) as in still "virgin" balding areas.
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