Written by the AfroHairClinicTurkey editorial team, drawing on the clinical experience of our medical team · Last updated September 3, 2026 · How we write and check this
On this page 4 sections
Why a curved follicle changes extraction
Under coily hair the follicle curves beneath the skin. Raise the curvature, then switch the technique, and watch what a straight extraction tool does to it. This is geometry — not a prediction about your hair.
The straight punch crosses the curved follicle — transection. That graft won’t grow.
In tightly curled hair the follicle sits curved beneath the skin rather than straight, with a bent, golf-club-shaped bulb and an asymmetric root sheath. (source)
The curvature is built into the follicle itself — it persists in hair grown in culture, and it tracks with curl pattern rather than with ethnic origin. (source)
What this shows, and what it does not. It is a general illustration of why a straight tool struggles with a curved root. It does not measure your follicles, predict your transection rate or graft survival, or say whether a transplant is right for you — those are decided in person, by a surgeon. The fix here is technique, not a gadget: reading the curl and following it.
Related: Find your own curl pattern · What transection means · FUE extraction · The evidence record
What goes wrong when a straight tool meets a curve
Turn the model above and the problem it is describing is a mismatch, not a difficulty. The instrument travels in a straight line. In tightly curled hair the follicle sits curved beneath the skin rather than straight, with a bent, golf-club-shaped bulb and an asymmetric root sheath.[1,2] Where the two disagree, the cutting edge can pass through the follicle instead of around it, and the graft it was meant to collect is destroyed on the way out.
That is , and it happens on every hair type — a punch is a blunt instrument aimed at something small. Curl does not introduce the problem; it narrows the margin for avoiding it. What a transection rate does to a graft count is arithmetic, and it is worked through on the graft page. What matters here is the geometry that produces it, which is the thing the model lets you look at from the side.
What surgeons do about the geometry
The response has not been to steady the hand. It has been to change the tool. Punch geometry is the lever surgeons have used against transection: shapes that keep the cutting edge away from the follicle beneath the skin have been reported to reduce it.[3]
Diameter is the other lever, and it is the one the literature has not settled: the largest published series in patients of African descent used wide punches throughout, while a recent complications review recommends going narrower to protect the donor skin. Both positions are published, and neither has been tested against the other. It is a fair thing to put to any clinic — not to catch them out, but because a surgeon who has thought about it will have an answer and a reason.
Can NeoGraft — or any automated device — be used on Afro-textured hair?
This is one of the most searched questions about textured hair and surgery, and it deserves an answer in two halves, because we can source one half and not the other.
What the evidence says about the punch. NeoGraft and the devices like it are automated, suction-assisted versions of , and what they drive is a rotary punch. In a published case series of eighteen patients with tightly curled hair, conventional rotary punches either failed outright or did not perform as they do on straight hair.[4] That is not a statement about one brand. It is a statement about the geometry the model above shows: a straight tool travelling into a curved follicle meets the follicle side-on.[1,2] And scalp thickness and firmness change the picture again from one patient to the next.[5]
What nobody has published. We went looking for a comparison of automated and manual on tightly curled hair, and we did not find one. Not a weak study, not a small one — none that we could find. So the honest answer to “is the machine better or worse than a person here” is that it has not been measured, and anyone telling you otherwise is telling you their preference in the voice of evidence.
What follows from that is not “avoid this device” and it is not “this device is fine”. It is a better question to ask a clinic: what punch are you using on my hair, and how do you decide? A clinic that answers with a brand name has answered a marketing question. A clinic that talks about diameter, sharpness and how it follows the curve has answered yours.
Frequently asked questions
What is transection in a hair transplant?
It is damage to a follicle during extraction — the punch cuts through it rather than around it, and that graft is lost. It happens with every hair type. What tightly curled hair changes is how little margin the surgeon has for avoiding it.
Does curly hair make a transplant riskier?
It makes extraction more technically demanding rather than more dangerous. The follicle curves below the skin, so a straight instrument has more of it to cut across. That is a question about the tool and the surgeon’s method, not about whether the operation is safe.
Can NeoGraft or a robot be used on Afro-textured hair?
Nobody has published a comparison of automated and manual extraction on tightly curled hair, so the honest answer is that it has not been measured. What is published is that conventional rotary punches struggled in a case series of tightly curled hair. The useful question is what punch a clinic uses and how it decides, not which brand of device it owns.
What punch size is right for Afro-textured hair?
The literature disagrees with itself on this, and we are not going to pretend otherwise. Larger and smaller diameters each have published support, and no study has tested them against each other. A clinic that can explain its choice has answered you; one that quotes a number as settled has not.
Can a clinic tell my transection rate before surgery?
Not for you specifically. It can tell you the rate it measures across its own cases on hair like yours, which is a different and more useful thing — and a clinic that has never measured it cannot tell you either.
Clinical references
- Thibaut S, Gaillard O, Bouhanna P, Cannell DW, Bernard BA. Human hair shape is programmed from the bulb. Br J Dermatol. 2005;152(4):632-8. view source →
- Thibaut S, Barbarat P, Leroy F, Bernard BA. Human hair keratin network and curvature. Int J Dermatol. 2007;46 Suppl 1:7-10. view source →
- Gupta AK, Bruce A, Trivellini R, Dua K, Mohebi P, True RH, et al. Innovations hair restoration surgeons have made to adapt to the challenges of follicular unit excision. Journal of cosmetic dermatology. 2020;19(8):1883-1891. view source →
- Umar S. Comparative Study of a Novel Tool for Follicular Unit Extraction for Individuals with Afro-textured Hair. Plastic and reconstructive surgery. Global open. 2016;4(9):e1069. view source →
- Umar S, Khanna R, Lohlun B, Maldonado JC, Zollinger M, Osei-Tutu A, et al. Follicular Unit Excision in Patients of African Descent: A Skin-Responsive Technique. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.]. 2023;49(10):949-955. view source →
References are checked on the dates recorded in our evidence library. If a source has been superseded, tell us and we will update it.