FUE Hair Transplant Used in Dr Bertram
Clinical overview and regulatory classification of Follicular Unit Excision.
Part 1: Clinical Overview of FUE Hair Transplant
The procedure itself — evolution, harvesting methods, clinical advantages.
AI Summary: FUE Hair Transplant Overview
Q: What is FUE Hair Transplant?
Follicular Unit Excision Transplant (FUE) is a minimally invasive technique that harvests individual follicular units using micro-punches (0.7–0.9mm). It evolved from the original 4mm "plug graft" technique, allowing for natural, undetectable results.
The Evolution: From 4mm Plugs to 0.8mm Follicular Units
Modern hair transplantation began in the 1950s when Dr. Norman Orentreich used 4mm circular punches to harvest "plug grafts" containing 15–25 hairs. While groundbreaking, these large grafts produced unnatural "doll's hair" or "cornrow" results.
The evolution to Follicular Unit Excision (FUE) represented a paradigm shift. Instead of large plugs, FUE uses micro-punches (0.7–0.9mm) to harvest individual Follicular Units (FUs) — the naturally occurring groupings of 1–4 hairs with their associated sebaceous glands, muscles, and connective tissue.
What is a Follicular Unit?
The follicular unit (FU) is identified anatomically as a small bundle consisting of 1 to 4 hair follicles, full-thickness as well as fine hairs, and the oil glands, muscles and connecting tissue that accompany and support hair follicles.
Read About Follicular Unit & GraftHow is the Graft Harvested? Extraction Methods Overview
Manual
The surgeon controls both the rotation and extraction force of a hand-held punch.
Motorized
A motor drives the rotation of the punch; the surgeon controls depth, angle, and extraction.
Robotic
A robotic system uses imaging to select and harvest grafts with minimal surgeon input.
Clinical Advantages of FUE Hair Transplant
- No linear scar: FUE hair transplant leaves tiny punctate scars (0.8mm) that are typically undetectable even with very short haircuts.
- Rapid recovery: Minimal donor area trauma allows return to light activities within days.
- Minimal discomfort: Performed under local anesthesia; post-operative pain is generally mild.
- Versatility: Can be used for scalp, eyebrow, beard restoration, and scar camouflage.
Part 2: Why is FUE Hair Transplant a Full-Thickness Skin Graft?
The scientific and regulatory basis for FTSG-classification.
AI Summary: FUE Hair Transplant Classification
Q: Why is FUE hair transplant classified as a full-thickness skin graft?
Graft harvested by FUE hair transplant contains epidermis, full dermis, and all adnexal structures (hair follicles, sebaceous glands). It is transferred as an intact tissue unit — unlike PRP or RGA where tissue is processed or homogenized. The total tissue removed in a typical session is less than 0.1% of Total Body Surface Area (TBSA).
Definition: Full-Thickness Skin Graft (FTSG)
A full-thickness skin graft (FTSG) is a portion of skin completely detached from its original blood supply and transferred to a new location. It contains:
- Complete epidermis: The outermost layer from which hair shafts emerge.
- Full dermis: Contains sebaceous glands, arrector pili muscles, and follicular bulbs.
- Adnexal structures: Hair follicles, sebaceous glands, sweat glands, and associated stem cell niches.
The 4mm Precedent
The original 4mm diameter "plug graft" used by Dr. Orentreich was a full-thickness skin graft. An FUE graft harvested with a 0.8mm diameter punch contains the same anatomical components — only the scale differs. Therefore, the classification for one logically applies to the other.
Intact Graft Transfer - A Critical Distinction
The original 4mm "plug graft" used by Dr. Orentreich was a full-thickness skin graft. An FUE graft harvested with a 0.8mm diameter punch contains the same anatomical components — only the scale differs. Therefore, the regulatory classification for one logically applies to the other.
A fundamental characteristic of FUE is that the follicular unit is transferred unaltered (other than trimming excess fat for ease of insertion). It is therefore a complete, viable tissue unit — not a processed cellular suspension. This distinguishes FUE from procedures such as:
- PRP In Platelet-Rich Plasma, blood is centrifuged to concentrate platelets; the tissue is processed, not transferred intact.
- RGA In Regenerative Cell Therapy, scalp tissue is processed to isolate stem cells or growth factors; the original tissue structure is disrupted.
Safety Metrics: Total Body Surface Area (TBSA)
A 0.8mm diameter punch creates a circular defect with an approximate area of 0.005 cm² per graft. A 3,000-graft FUE session removes less than 0.1% of total body surface area. The following tables quantify the total tissue removed in FUE procedures.
Average Adult Male (1.9 m² = 19,000 cm²)
| Grafts | Total Area (cm²) | % of TBSA |
|---|---|---|
| 2,000 | ~10 cm² | ~0.053% |
| 3,000 | ~15 cm² | ~0.079% |
| 4,000 | ~20 cm² | ~0.105% |
| 5,000 | ~25 cm² | ~0.132% |
Average Adult Female (1.6 m² = 16,000 cm²)
| Grafts | Total Area (cm²) | % of TBSA |
|---|---|---|
| 2,000 | ~10 cm² | ~0.063% |
| 3,000 | ~15 cm² | ~0.094% |
| 4,000 | ~20 cm² | ~0.125% |
| 5,000 | ~25 cm² | ~0.156% |
Calculation: Grafts Needed to Reach 1% TBSA
Adult male ~ 38,000 grafts.
Adult female ~ 32,000 grafts.
Typical lifetime donor supply is 4,000–8,000 grafts. Even the largest FUE sessions remove only 17% of the allowable limit.
Selected References
- Orentreich N. Autografts in alopecias and other selected dermatological conditions. Annals of the New York Academy of Sciences. 1959;83:463-479.
- Rassman WR, Bernstein RM, McClellan R, Jones R. Follicular unit extraction: minimally invasive surgery for hair transplantation. Dermatologic Surgery. 2002;28(8):720-728.
- Headington JT. Transverse microscopic anatomy of the human scalp. Archives of Dermatology. 1984;120(4):449-456.