{"id":165,"date":"2026-10-19T11:06:56","date_gmt":"2026-10-19T11:06:56","guid":{"rendered":"https:\/\/trapiantocapelli.com\/?p=165"},"modified":"2026-10-19T11:41:08","modified_gmt":"2026-10-19T11:41:08","slug":"follicular-unit-excision-fue-principles-evolution","status":"publish","type":"post","link":"https:\/\/trapiantocapelli.com\/en\/fue-technique\/follicular-unit-excision-fue-principles-evolution\/","title":{"rendered":"Follicular Unit Excision (FUE): principles, anatomical basis and evolution of the technique"},"content":{"rendered":"<article class=\"tc-article\" lang=\"en\">\n<p class=\"tc-kicker\">Section 6 \u00b7 FUE Technique and Harvesting<\/p>\n<h1>Follicular Unit Excision (FUE): principles, anatomical basis and evolution of the technique<\/h1>\n<dl class=\"tc-meta\">\n<dt>Editorial direction<\/dt>\n<dd><a href=\"https:\/\/trapiantocapelli.com\/en\/team\/\">Dir. Mario Luigi Pallaoro<\/a>, Clinica Pallaoro, Padua<\/dd>\n<dt>Scientific review<\/dt>\n<dd><a href=\"https:\/\/www.pallaoro.it\/dott-gianandre-alvarez-pallaoro\" target=\"_blank\" rel=\"noopener\">Dr Gianandr\u00e8 Alvarez Pallaoro<\/a>, hair restoration surgeon, Clinica Pallaoro<\/dd>\n<dt>Audience<\/dt>\n<dd>Plastic surgeons, dermatologists, trichologists, researchers and residents<\/dd>\n<dt>Level of evidence<\/dt>\n<dd><span class=\"tc-evidence\">Level 3\u20134<\/span> case series, non-randomised comparative studies and expert consensus; basic science for the anatomical premises<\/dd>\n<dt>Last updated<\/dt>\n<dd>October 2026<\/dd>\n<\/dl>\n<figure class=\"tc-figure\"><figcaption><strong>Figure 6.1<\/strong> \u2014 The principle of FUE: a cylindrical punch of submillimetre diameter, aligned with the axis of the hair shafts, incises the skin around a single follicular unit. The divergence of the follicles at depth, the anchoring point at the level of the bulge and the depth of the bulb determine the risk of transection.<\/figcaption><\/figure>\n<section class=\"tc-abstract\">\n<h2><span class=\"tc-num\">1.<\/span>Clinical abstract and executive summary<\/h2>\n<p>Follicular Unit Excision (FUE) is the harvesting technique in which each follicular unit is isolated individually from the donor area with a punch less than one millimetre in diameter, without removing an ellipse of skin. Systematically described in the early 2000s<sup class=\"tc-cite\"><a href=\"#ref-1\">1<\/a><\/sup>, it has evolved from a niche method, considered difficult and poorly reproducible, into the most widely used harvesting technique in hair restoration surgery. Its spread has been driven by patient demand, the development of instruments and the experience accumulated by surgeons<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/p>\n<p>In 2018 the International Society of Hair Restoration Surgery changed the meaning of the acronym from <em>extraction<\/em> to <em>excision<\/em>, to emphasise the surgical nature of the procedure and to counter the idea that harvesting simply means &#8220;pulling out&#8221; hairs<sup class=\"tc-cite\"><a href=\"#ref-7\">7<\/a><\/sup>. This pillar article describes the anatomical premises of FUE, the harvesting steps, the evolution of instruments, quality indicators and the limits of the technique. The individual operative aspects are covered in the other articles of section 6.<\/p>\n<ul class=\"tc-keypoints\">\n<li>FUE is a surgical act: it requires diagnosis, planning and a qualified medical operator<sup class=\"tc-cite\"><a href=\"#ref-7\">7<\/a><\/sup>.<\/li>\n<li>The most commonly used punch has a diameter of about 0.9 mm, within a range of 0.8 to 1.15 mm<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/li>\n<li>The critical point of harvesting is the anchorage of the follicle at the isthmus, where the arrector pili muscle inserts<sup class=\"tc-cite\"><a href=\"#ref-4\">4<\/a>,<a href=\"#ref-5\">5<\/a><\/sup>.<\/li>\n<li>The transection rate is the main quality indicator; a target below 5\u201310% is recommended<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/li>\n<\/ul>\n<\/section>\n<h2><span class=\"tc-num\">2.<\/span>Microscopic and ultrastructural anatomy: what the punch must respect<\/h2>\n<h3>The follicular unit as the target<\/h3>\n<p>FUE harvests the follicular unit in its entirety: 1\u20134 terminal follicles emerging from a common area of skin, with the sebaceous lobules, the arrector pili muscle and the collagen sleeve that surrounds them. The arrector pili muscle connects to all the follicles of the unit and helps hold them together<sup class=\"tc-cite\"><a href=\"#ref-4\">4<\/a><\/sup>. At the surface the shafts converge in a small area, but at depth the follicles may diverge (<em>splay<\/em>): a punch centred on the emergence may therefore contain the unit at the surface yet cut across one of the follicles further down.<\/p>\n<h3>Depth and position of the structures<\/h3>\n<p>The morphometric study by Jim\u00e9nez, Izeta and Poblet described the length of terminal scalp follicles and the relative position of the bulge and bulb<sup class=\"tc-cite\"><a href=\"#ref-3\">3<\/a><\/sup>. The bulge lies in the upper third of the follicle, at the level of the arrector pili insertion; the bulb lies in the subcutaneous fat. This distribution explains the strategy of modern FUE: a sharp incision limited to the first few millimetres, sufficient to free the follicle from its superficial anchorage, followed by deeper dissection that separates rather than cuts.<\/p>\n<h3>The point of maximum attachment<\/h3>\n<p>Bulge stem cells deposit nephronectin in the underlying basement membrane, to which the arrector pili muscle anchors<sup class=\"tc-cite\"><a href=\"#ref-5\">5<\/a><\/sup>. The point of maximum mechanical attachment of the follicle therefore coincides with its stem cell region. A graft pulled out forcefully before this anchorage has been released risks being stretched, broken or stripped of its bulge: this is the biological basis of the operative rule that extraction should be performed with minimal traction.<\/p>\n<h2><span class=\"tc-num\">3.<\/span>Molecular dynamics and signalling pathways: why integrity matters<\/h2>\n<p>A graft regrows reliably when it preserves the two compartments that govern follicle regeneration: the bulge, with its epithelial stem cells, and the dermal papilla, which produces the inductive signals needed to start each new anagen. The Wnt\/\u03b2-catenin pathway, activated by signals from the papilla, drives stem cell activation at the start of each cycle.<\/p>\n<p>Kim and Choi observed that follicular portions without the bulb can regrow, probably owing to the regenerative capacity of the sheath and bulge<sup class=\"tc-cite\"><a href=\"#ref-6\">6<\/a><\/sup>. This finding explains why some transected follicles regrow, but it does not make transection acceptable: a damaged follicle is less likely to regrow and often produces a shaft of reduced calibre. The sleeve of perifollicular tissue that accompanies the graft also protects the papilla and matrix from desiccation and forceps trauma.<\/p>\n<h2><span class=\"tc-num\">4.<\/span>Pathophysiology and clinical correlations: from punch grafting to FUE<\/h2>\n<h3>Historical evolution<\/h3>\n<p>The first modern hair transplants used punches several millimetres in diameter, which harvested and implanted islands of skin containing numerous follicles. The results were often unnatural, with the characteristic &#8220;tufted&#8221; appearance. Recognition of the follicular unit as a natural anatomical structure led, in the 1990s, to the transplantation of individual follicular units obtained by microscopic dissection of an ellipse of occipital skin (FUT or strip). FUE applied the same principle while eliminating the ellipse: each unit is excised directly from the skin with a punch of minimal diameter<sup class=\"tc-cite\"><a href=\"#ref-1\">1<\/a><\/sup>.<\/p>\n<h3>Healing of the donor site<\/h3>\n<p>Each excision leaves a small circular wound that heals by secondary intention within a few days, leaving a hypopigmented punctate scar. Individually these scars are barely visible; their number and distribution, however, determine the final appearance of the donor area. The recognised advantages of FUE are less postoperative discomfort in the donor area and the absence of a linear scar; the disadvantages are the longer duration of the procedure and a long learning curve<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/p>\n<h3>The donor area as a finite resource<\/h3>\n<p>Every unit harvested does not regenerate. Uneven or excessive harvesting produces visible thinning and, in extreme cases, a depleted donor area that precludes future procedures. The authors of the update in Actas Dermo-Sifiliogr\u00e1ficas indicate 1,500\u20132,000 follicular units as the usual quantity per operating day<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>. The overall limit depends on the density and surface area of each patient&#8217;s safe donor area.<\/p>\n<h2><span class=\"tc-num\">5.<\/span>Surgical protocols and impact on FUE microsurgery<\/h2>\n<h3>The harvesting steps<\/h3>\n<ol class=\"tc-steps\">\n<li><strong>Preparation of the donor area.<\/strong> Full, partial or no shaving, depending on the patient&#8217;s needs and the planned number of grafts.<\/li>\n<li><strong>Anaesthesia and tumescence.<\/strong> Infiltration of saline before incision increases tissue turgor and tends to make the follicles more vertical, reducing the risk of transection<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/li>\n<li><strong>Incision.<\/strong> The punch is aligned with the axis of the emerging shaft and inserted to a limited depth. With sharp punches the recommended depth is about 2.5\u20133 mm<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/li>\n<li><strong>Dissection.<\/strong> With blunt or hybrid punches, dissection can go deeper, separating the follicle from the surrounding tissue without cutting it, but with the risk of pushing the graft beneath the surface (buried graft)<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>.<\/li>\n<li><strong>Extraction.<\/strong> The graft is grasped by its perifollicular tissue and withdrawn with minimal traction, then inspected and placed in storage solution.<\/li>\n<\/ol>\n<div class=\"tc-table-wrap\">\n<table class=\"tc-table\">\n<caption>Table 6.1 \u2014 FUE harvesting instruments: general characteristics<\/caption>\n<thead>\n<tr>\n<th>Instrument<\/th>\n<th>Principle<\/th>\n<th>Strengths<\/th>\n<th>Limitations<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sharp punch<\/td>\n<td>Incises the skin and superficial dermis<\/td>\n<td>Clean incision, depth control<\/td>\n<td>Risk of transection if the angle is incorrect<\/td>\n<\/tr>\n<tr>\n<td>Blunt punch<\/td>\n<td>Separates the follicle from the tissues by dissection<\/td>\n<td>Follows the curvature of the follicle at depth<\/td>\n<td>Possible buried grafts, greater skin trauma<\/td>\n<\/tr>\n<tr>\n<td>Hybrid punch<\/td>\n<td>Partly sharp, partly blunt edge<\/td>\n<td>Compromise between incision and dissection<\/td>\n<td>Requires experience in adjustment<\/td>\n<\/tr>\n<tr>\n<td>Motorised systems<\/td>\n<td>Rotation, oscillation or combined modes<\/td>\n<td>Speed, less fatigue<\/td>\n<td>Heat and torsion if poorly adjusted<\/td>\n<\/tr>\n<tr>\n<td>Robotic systems<\/td>\n<td>Image-guided identification and incision<\/td>\n<td>Reproducibility of the movement<\/td>\n<td>Cost, adaptability to curly or light hair<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>Instruments and their evolution<\/h3>\n<p>Punch diameter has progressively decreased: punches between 0.8 and 1.15 mm are generally used today, with 0.9 mm as the most frequent choice<sup class=\"tc-cite\"><a href=\"#ref-2\">2<\/a><\/sup>. Alongside manual punches, motorised systems with rotary, oscillating or combined movements have become widespread, as have robotic systems in which identification of the units and incision are image-guided. Avram and Watkins described the principles, steps and results of robotic harvesting, whose main aim is reproducibility of the movement<sup class=\"tc-cite\"><a href=\"#ref-8\">8<\/a><\/sup>; automatic identification of the units can be more difficult when contrast between hair and skin is low or the hair is very wavy. No instrument is superior in every situation: the choice depends on the characteristics of the hair and skin and on the surgeon&#8217;s experience.<\/p>\n<h2><span class=\"tc-num\">6.<\/span>Regenerative medicine and adjuvant treatments<\/h2>\n<p>Between harvesting and implantation the graft is ischaemic tissue: its survival depends on out-of-body time, temperature and the storage solution, topics covered in section 7. Various adjuvants have been proposed to improve graft survival and speed up healing of the donor area, including platelet-rich plasma as a storage medium or by infiltration. The available evidence is of moderate or low quality and protocols are not standardised: these treatments do not compensate for technically inadequate harvesting.<\/p>\n<h2><span class=\"tc-num\">7.<\/span>Risk management and anatomical limits<\/h2>\n<ul>\n<li><strong>Transection.<\/strong> It should be measured systematically on samples of grafts and corrected during the procedure by changing the angle, depth, diameter or type of punch.<\/li>\n<li><strong>Buried grafts.<\/strong> Overly deep dissection with blunt punches can push the graft beneath the skin, with a risk of cysts and folliculitis.<\/li>\n<li><strong>Overharvesting.<\/strong> Too many or too concentrated excisions produce visible thinning and compromise future sessions.<\/li>\n<li><strong>Non-physician operators.<\/strong> FUE is a surgical procedure. The ISHRS reports complications, some of them serious, in procedures performed by unlicensed personnel<sup class=\"tc-cite\"><a href=\"#ref-7\">7<\/a><\/sup>; the full statement is available on the website of the <a href=\"https:\/\/ishrs.org\/2018\/03\/06\/popular-hair-restoration-technique-updates-name-to-reflect-surgical-nature-of-procedure\/\" target=\"_blank\" rel=\"noopener\">International Society of Hair Restoration Surgery<\/a>.<\/li>\n<li><strong>Learning curve.<\/strong> FUE outcomes depend heavily on the operator&#8217;s experience: data from the literature obtained by experienced surgeons are not automatically transferable.<\/li>\n<\/ul>\n<section class=\"tc-tips\">\n<h2><span class=\"tc-num\">8.<\/span>Clinical tips &amp; tricks from the medical team<\/h2>\n<ul>\n<li><strong>First units as a test.<\/strong> Examine the first extractions from each donor region under the microscope to assess splay, length and integrity, and adjust diameter and depth accordingly.<\/li>\n<li><strong>Alignment before speed.<\/strong> A punch perfectly aligned with the axis of the shaft reduces transection more than any motor setting.<\/li>\n<li><strong>Minimal traction.<\/strong> If the graft does not come free easily, the superficial anchorage has not been released: complete the dissection rather than pulling.<\/li>\n<li><strong>Even distribution.<\/strong> Alternating excisions and leaving intact units between them preserves the appearance of the donor area.<\/li>\n<li><strong>Record the data.<\/strong> Noting the punch diameter, type of instrument and transection rate for each session makes it possible to improve the technique over time.<\/li>\n<\/ul>\n<p class=\"tc-signature\">\u2014 Methodological approach of the Clinica Pallaoro team, Padua<\/p>\n<\/section>\n<h2><span class=\"tc-num\">9.<\/span>Critical discussion and conclusions<\/h2>\n<p>In less than thirty years, FUE has moved from an experimental technique to the reference harvesting method. The literature supporting it, however, consists mainly of case series and non-randomised comparative studies: controlled comparisons between punch types, motorised and robotic systems are lacking, and definitions of transection and graft survival are not uniform across studies. Many operative recommendations reflect the experience of individual surgeons rather than generalisable evidence.<\/p>\n<p>Future developments concern more adaptive instruments, able to respond in real time to tissue resistance, imaging systems to estimate follicle angle and depth before incision, and standardisation of quality indicators. In the meantime, the principles remain those described in this article: respect for the anatomy of the follicular unit, integrity of the bulge and bulb, prudent distribution of harvesting, and awareness that FUE is in every respect a surgical procedure.<\/p>\n<h2><span class=\"tc-num\">10.<\/span>Annotated scientific bibliography<\/h2>\n<ol class=\"tc-refs\">\n<li id=\"ref-1\">Rassman WR, Bernstein RM, McClellan R, et al. Follicular unit extraction: minimally invasive surgery for hair transplantation. <em>Dermatol Surg.<\/em> 2002;28(8):720-728. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12174065\/\" target=\"_blank\" rel=\"noopener\">PubMed<\/a><span class=\"tc-annot\">First systematic description of the FUE technique.<\/span><\/li>\n<li id=\"ref-2\">Jim\u00e9nez-Acosta F, Ponce-Rodr\u00edguez I. Follicular unit extraction for hair transplantation: an update. <em>Actas Dermosifiliogr.<\/em> 2017;108(6):532-537. <a href=\"https:\/\/doi.org\/10.1016\/j.adengl.2017.05.018\" target=\"_blank\" rel=\"noopener\">DOI<\/a><span class=\"tc-annot\">Update on the technique: punch diameters, incision depth, tumescence, instruments and practical limits.<\/span><\/li>\n<li id=\"ref-3\">Jim\u00e9nez F, Izeta A, Poblet E. Morphometric analysis of the human scalp hair follicle: practical implications for the hair transplant surgeon and hair regeneration studies. <em>Dermatol Surg.<\/em> 2011;37(1):58-64. <a href=\"https:\/\/portalinvestigacion.um.es\/documentos\/5d95a0b22999525d7e94c34b\" target=\"_blank\" rel=\"noopener\">University of Murcia<\/a><span class=\"tc-annot\">Morphometric data on the position of the bulge and bulb.<\/span><\/li>\n<li id=\"ref-4\">Poblet E, Jim\u00e9nez F, Ortega F. The contribution of the arrector pili muscle and sebaceous glands to the follicular unit structure. <em>J Am Acad Dermatol.<\/em> 2004;51(2):217-222. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/15280840\/\" target=\"_blank\" rel=\"noopener\">PubMed<\/a><span class=\"tc-annot\">Role of the arrector pili muscle in the structure of the follicular unit.<\/span><\/li>\n<li id=\"ref-5\">Fujiwara H, Ferreira M, Donati G, et al. The basement membrane of hair follicle stem cells is a muscle cell niche. <em>Cell.<\/em> 2011;144(4):577-589. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/21335239\/\" target=\"_blank\" rel=\"noopener\">PubMed<\/a><span class=\"tc-annot\">Anchorage of the arrector pili to the bulge niche via nephronectin.<\/span><\/li>\n<li id=\"ref-6\">Kim JC, Choi YC. Regrowth of grafted human scalp hair after removal of the bulb. <em>Dermatol Surg.<\/em> 1995;21(4):312-313. <a href=\"https:\/\/research.knu.ac.kr\/en\/publications\/regrowth-of-grafted-human-scalp-hair-after-removal-of-the-bulb\/\" target=\"_blank\" rel=\"noopener\">Kyungpook National University<\/a><span class=\"tc-annot\">Regenerative capacity of upper follicular segments.<\/span><\/li>\n<li id=\"ref-7\">International Society of Hair Restoration Surgery. Popular hair restoration technique updates name to reflect surgical nature of procedure. Press release, 6 March 2018. <a href=\"https:\/\/ishrs.org\/2018\/03\/06\/popular-hair-restoration-technique-updates-name-to-reflect-surgical-nature-of-procedure\/\" target=\"_blank\" rel=\"noopener\">ISHRS<\/a><span class=\"tc-annot\">Change of name from extraction to excision and position on procedures performed by non-physicians.<\/span><\/li>\n<li id=\"ref-8\">Avram MR, Watkins SA. Robotic follicular unit extraction in hair transplantation. <em>Dermatol Surg.<\/em> 2014;40(12):1319-1327. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25418806\/\" target=\"_blank\" rel=\"noopener\">PubMed<\/a><span class=\"tc-annot\">Review of robotic systems for FUE harvesting.<\/span><\/li>\n<\/ol>\n<p class=\"tc-disclaimer\">Content intended for healthcare professionals for continuing scientific education. It does not replace individual clinical assessment. \u00a9 Clinica Pallaoro \u2014 trapiantocapelli.com<\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Section 6 \u00b7 FUE Technique and Harvesting Follicular Unit Excision  [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":166,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40],"tags":[],"class_list":["post-165","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fue-technique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>FUE: Principles and Evolution- trapiantocapelli.com<\/title>\n<meta name=\"description\" content=\"Follicular Unit Excision (FUE): history, anatomical basis, harvesting steps, punch types, motorised and robotic systems, transection and donor area limits. 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