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Dermatome — Overview

A dermatome is a calibrated skin-harvesting instrument that produces uniform-thickness split-thickness skin grafts (STSG) — the workhorse modality for scrotal reconstruction after Fournier's gangrene, post-radical-skin-excision resurfacing, phalloplasty donor-site coverage, and any large GU / perineal wound coverage problem. The class spans handheld manual (Humby / Watson), drum (Padgett-Hood), and powered electric / pneumatic (Zimmer, Brown, Padgett powered) devices — each with distinct trade-offs in precision, portability, and setup complexity.[1][2]

Variants​

  • Zimmer Air DermatomePneumatic powered — US workhorse; requires compressed-gas supply.
  • Padgett DermatomeElectric powered — alternative to Zimmer, wall-outlet power only; also used for free-flap de-epithelialization in reconstructive surgery.
  • Humby DermatomeHandheld manual freehand knife with adjustable roller guard — the classic British design; limited-resource workhorse.
  • Goulian (Weck) DermatomeSmall handheld — narrow grafts, built-in depth guard.
  • Drum Dermatome (Padgett-Hood)Historical rotating-drum design — the 1939 origin of calibrated STSG harvest.
  • Skin MesherNot a dermatome proper — expands a harvested graft at a fixed ratio.

Powered vs Manual — What Surgeons Prefer​

A survey of British plastic surgeons found that 61% preferred powered dermatomes, primarily on the belief they produced better-quality grafts and donor sites. Notably, no evidence supported the superiority of one instrument over the other — preference is largely training-pattern and availability driven.[1]

Thickness Settings and Graft Classification​

The dermatome's calibrated lever determines graft thickness. Standard classification:[3][4]

Graft typeThickness (inches)Thickness (mm)Reconstructive use
Thin (Thiersch)0.005–0.0120.13–0.30Coverage where contraction is acceptable; large TBSA burns
Intermediate0.012–0.0180.30–0.46Default for genital / perineal coverage
Thick (Padgett)0.018–0.0280.46–0.71Robust recipient sites; less shrinkage, slower donor healing
Full-thickness (FTSG)Entire dermis—Small grafts where donor is primarily closed; cosmetic glans / hand / face work

Thicker grafts shrink less and provide better cosmetic outcomes but create deeper donor wounds that heal more slowly. FTSG requires primary closure of the donor site, limiting graft size.[4]

Accuracy Caveat — Dialed Thickness ≠ Actual Thickness​

A pediatric cohort study of 140 STSGs harvested at a dial setting of 0.007 inches found a median actual thickness of 6.94 / 1000 inches but with a wide IQR (5.05–9.28 / 1000) — and no preoperative predictors of thickness deviation could be identified.[5]

The "scalpel dermatome test" — placing a #15 scalpel blade (mean thickness ~ 15 / 1000 inches) through the blade aperture — has been proposed as a simple intraoperative method to objectively validate the aperture setting. Intra-observer reliability was good (ICC 0.89), but inter-observer reliability only moderate (ICC 0.52), and individual dermatomes showed significant aperture differences.[6]

Practical implication: don't assume the dial reading is the truth. Calibrate intraoperatively if accurate thickness matters for the recipient bed.

Reconstructive / Urogyn Uses​

  • Scrotal reconstruction after Fournier's gangrene — the single most common GU indication
  • Resurfacing after radical skin excision for hidradenitis suppurativa, severe lichen sclerosus, or buried-penis reconstruction
  • Coverage over tissue expanders in staged penile reconstruction
  • Meshed STSG for large wound coverage in genital / perineal reconstruction
  • Phalloplasty donor-site coverage — radial forearm / ALT / musculocutaneous latissimus dorsi free-flap donor sites
  • Vaginoplasty neovaginal lining — STSG-lined neovagina as an alternative to penile-inversion or intestinal vaginoplasty
  • GAS revision — perineal wound resurfacing after flap loss / complication

Donor Site Selection​

SiteNotes
Anterolateral / anterior thighMost common — default for genital reconstruction
Lateral thighStandard alternative
Buttock / posterior thigh / lower backFemale patients prefer posterior locations over anterior (Garcia 2014)[7]
Upper medial armHidden donor; smaller harvest area
Occipital scalpFaster re-epithelialization, less pain, fewer complications, better cosmetic outcome vs femoral in dermatosurgery RCT (Kovacs 2017)[8] — worth considering in non-burn elective coverage
Anterior trunkTechnically difficult due to rib irregularity + lax abdominal skin; K-wire–assisted harvesting has been described to create a firm flat surface (Yontar 2016)[9]

Donor-Site Healing​

Donor sites heal by re-epithelialization from residual dermal appendages (hair follicles, sweat glands) and wound edges:[4][10]

  • Thin grafts: 1–2 weeks
  • Thicker grafts: 2–3 weeks
  • Reharvesting possible after 2–3 weeks of adequate healing — critical in major burns covering > 60% TBSA where donor skin is limited

Practical Technique Pearls​

  • Tumescent infiltration of the donor site with saline or dilute epinephrine creates a firm flat surface and reduces bleeding during harvest.
  • Lubricate the skin surface with mineral oil or equivalent before passage to reduce friction.
  • Steady advance, consistent downward pressure — too much pressure yields a thicker graft, too little causes skip areas.
  • Mesh the harvested graft (1.5:1 typical, up to 3:1 for large coverage needs) to expand area, accepting that the mesh pattern persists permanently. See the skin mesher page.
  • Confirm aperture intraoperatively with the scalpel-blade test (Dargan 2025) when accurate thickness matters.[6]

Historical Evolution​

The skin-graft instrumentation lineage:[2]

  1. Reverdin pinch grafting (1869) — small epidermal grafts placed on wounds
  2. Ollier and Thiersch grafting (1870s–1880s) — larger thinner grafts using razor blades
  3. Padgett drum dermatome (1939) — first calibrated instrument for uniform-thickness grafts
  4. Brown electric dermatome (1948) — first powered oscillating-blade dermatome
  5. Tanner mesh grafting (1964) — allowed expansion of harvested grafts to cover larger areas
  6. Modern powered dermatomes (Zimmer pneumatic, Padgett powered) — current standard

See also: STSG, Grafts in GU Reconstruction, Fournier's Gangrene, Quilting Stitch, Skin Mesher.

References​

1. Tehrani H, Lindford A, Logan AM. "Hand knife versus powered dermatome: current opinions, practices, and evidence." Ann Plast Surg. 2006;57(1):77–9. doi:10.1097/01.sap.0000214902.79193.4e

2. Singh M, Nuutila K, Collins KC, Huang A. "Evolution of skin grafting for treatment of burns: Reverdin pinch grafting to Tanner mesh grafting and beyond." Burns. 2017;43(6):1149–1154. doi:10.1016/j.burns.2017.01.015

3. Hattori Y, Imai S, Niu A. "Padgett dermatome for de-epithelialization of free flaps in breast reconstruction." Microsurgery. 2020;40(3):419–420. doi:10.1002/micr.30568

4. Greenhalgh DG. "Management of burns." N Engl J Med. 2019;380(24):2349–2359. doi:10.1056/NEJMra1807442

5. McBride CA, Kempf M, Kimble RM, Stockton K. "Variability in split-thickness skin graft depth when using an air-powered dermatome: a paediatric cohort study." Burns. 2017;43(7):1552–1560. doi:10.1016/j.burns.2017.02.010

6. Dargan DP, Gottlieb LJ, Vrouwe SQ. "Assessment of the scalpel blade as an objective tool for measuring dermatome cut thickness." J Burn Care Res. 2025;iraf067. doi:10.1093/jbcr/iraf067

7. Garcia E, Stone E, Chan LS, Van Vliet M, Garner WL. "Donor-site preferences in women during autologous skin grafting." Plast Reconstr Surg. 2014;133(3):378e–382e. doi:10.1097/PRS.0000000000000062

8. Kovacs M, Karsai S, Podda M. "Superiority of occipital donor sites for split-thickness skin grafting in dermatosurgery: results of a prospective randomized controlled study." J Dtsch Dermatol Ges. 2017;15(10):990–997. doi:10.1111/ddg.13337

9. Yontar Y, Coruh A, Severcan M. "K-wire assisted split-thickness skin graft harvesting from the anterior trunk." Burns. 2016;42(1):222–229. doi:10.1016/j.burns.2015.09.012

10. Younis AS, Abdelmonem IM, Gadullah M, et al. "Hydrogel dressings for donor sites of split-thickness skin grafts." Cochrane Database Syst Rev. 2023;8:CD013570. doi:10.1002/14651858.CD013570.pub2