Hair Transplant: Basics
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Direct answer
Donor dominance — Norman Orentreich's principle that transplanted follicles retain their original androgen-resistant behaviour wherever they land — is the entire scientific basis of hair transplantation: occipital hair moved into a bald frontal scalp keeps growing as occipital hair. The surgery redistributes, never creates, hair. Two harvest methods define modern practice: follicular unit transplantation (FUT), excising a strip of donor scalp and slivering it into follicular units of one to four hairs, and follicular unit extraction (FUE), punching individual units (0.8-1 mm) without a linear scar. Planning runs on the Norwood stage, donor density and hairline design; regrowth begins at three to four months after the expected shock-loss shedding, maturing fully by twelve to eighteen months. Medical therapy with finasteride and minoxidil continues lifelong, because native hair keeps miniaturising.
What you must remember
- Core principle: donor dominance — the occipital "permanent" fringe resists dihydrotestosterone, so its follicles survive and grow wherever they are relocated.
- FUT versus FUE: FUT gives high graft yield per session at the cost of a linear occipital scar; FUE avoids the scar, permits very short hairstyles and body-hair harvesting, but is slower with higher transection risk in unskilled hands.
- Graft vocabulary and numbers: a follicular unit holds one to four terminal hairs with its sebaceous lobule; native density approximates one unit per square millimetre, transplantation achieves 30-50 units per square centimetre per session, and a stage III-VI male with good reserves commonly receives 1500-4000+ grafts across one or more sessions.
- Timeline to recite: shedding of transplanted shafts at three to six weeks (shock loss, including temporary native hair loss), regrowth from months three to four, cosmetic maturity at twelve to eighteen months.
- Medical therapy forever: finasteride 1 mg daily (DHT reduction; sexual adverse effects in a minority, post-finasteride syndrome remaining debated) plus topical minoxidil 5 per cent preserve the native fringe that frames the transplant.
- Contraindications and cautions: active scarring alopecia (quiesce disease first), poor donor density or diffuse unpatterned alopecia, unstable very-young pattern loss, unrealistic expectations and body dysmorphic disorder; keloidal tendency needs counselling in Indian skin.
- Complications list: folliculitis, transient shock loss, forehead oedema, hypoaesthesia from great occipital nerve injury (mainly FUT), wide or hypertrophic donor scarring, and an unnatural hairline from bad design rather than bad surgery.
- Indian context: India is a major global hub for hair restoration, priced per graft — financing access and tempting over-harvesting; vivas increasingly ask how you would counsel a medical tourist.
Counselling a candidate: the consultation that decides everything
A 28-year-old software engineer, Norwood III vertex, arrives transplant-minded with photographs of a film star. First, age and stability: his loss is early, so the plan pairs frontal hairline design with finasteride and minoxidil to defend the mid-scalp — operating without medical therapy creates an island of hair in a receding sea within five years. Second, FUE is selected because he crops his hair and refuses a linear scar; roughly 1800 grafts map to the frontal third. Third, the calendar: shafts shed in month one, regrowth begins at month four, and judgement waits until month twelve. He leaves with photographs, a written plan and the single most protective sentence in hair-transplant medicine: surgery moves hair, medicine keeps the rest.
Where candidates slip
The principle question looks easy and is answered badly: candidates mumble "hairs grow" instead of naming donor dominance — the specific phrase exams want. The second slip is timing: judging or abandoning a result at month two (when everything has shed and nothing regrown) or promising density at month three; the expected answer walks shedding at three to six weeks, regrowth at three to four months, maturity at twelve to eighteen. Third, the medical-therapy omission: a transplant plan without finasteride-minoxidil in a young Norwood III is the planted management error. Fourth, FUT-FUE trade-offs reduced to "FUE is better" — the mature answer weighs linear scar versus transection, yield and session size. Finally, the scarring-alopecia trap: operating on active lichen planopilaris transplants follicles into a battlefield, and the correct sequence is biopsy, quiescence, then surgery.
Frequently asked questions
What principle explains the survival of transplanted occipital hair?
Donor dominance — follicles keep their dihydrotestosterone-resistant behaviour at the recipient site, as established by Orentreich.
How do FUT and FUE differ fundamentally?
FUT harvests a strip yielding many follicular units with a linear scar; FUE extracts individual units with tiny punches, avoiding the scar at the cost of time and transection risk.
What is shock loss after transplantation?
Temporary shedding of transplanted shafts and some adjacent native hair at three to six weeks, with regrowth beginning by months three to four.
Why must finasteride and minoxidil continue after surgery?
The transplanted follicles resist dihydrotestosterone but native miniaturising hairs do not, so medical therapy preserves the surrounding hair that frames the result.
When is hair transplantation contraindicated in scarring alopecia?
While the scarring process is active — lichen planopilaris or discoid lupus must be diagnosed and quiesced before grafting, or the disease destroys the transplant.