A Hair Transplant takes time to grow and does not grow back at the same rate, but over 12 to 18 months in some cases; this is important to understand to appreciate where the growth should be at any particular stage.
It is uncommon that a hair transplant performed by an experience doctor will not grow and the yield should be around 90-95% of placed grafts regrowing.
Graft care is vital to the result of a hair transplant, from the moment they are extracted from the donor area; are the grafts only being removed from a safe zone, where the hair is immune to the effects of DHT, and male pattern loss.
When extracted via FUT or FUE transection is kept to minimum percentage and any transected grafts not placed as the probability they will regrow is minimal and even if they do the quality is generally miniaturised.
Not to transplant miniaturised hairs in the donor area; due to the trauma of extraction it will likely conclude they will not survive and regrow. If the % of miniaturisation in the donor is high it can mean a hair transplant is not advisable.
Once extracted the grafts need to be cleaned, this should always be under stereo microscopes to ensure the best quality and care is taken, and then held in the appropriate holding solution until they are placed in the recipient area.
Creating the recipient sites, depth control, how close the slits are made to each other, too close can impair healing, skin quality and regrowth or yield.
A follicular unit is delicate so holding the graft when being placed is important; if care is not taken too much pressure can be applied and the graft crushed, if placed it will not grow.
The patient also has a responsibility for graft care post operation, washing the grafted area, especially over the first 2 weeks as the scalp is healing and the grafts are bedding into the new area.
Care should be taken not to massage too hard or aggressively, not to knock your head on sharp objects; a graft can be dislodged from the recipient site and if not replaced with speed will not regrow.
As a potential patient you need to research thoroughly, try to speak to previous patients, question the doctor as to the clinic protocols and what happens if the yield is not as expected.