Hamilton-Norwood scheme

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The Hamilton-Norwood scheme divides androgenetic hair loss ( alopecia androgenetica ) in men into different stages, which are assigned to seven levels (I to VII). This schematic course classification was developed in 1951 by James Hamilton. O'Tar Norwood modified and expanded it in 1975. In about 80 percent of the men affected, the development of baldness follows the given classification. The Hamilton-Norwood scheme enables standardized medical documentation of hair loss. It is used, among other things, in the examination of those affected and in hair transplants .

A three-stage scheme derived from this was published by Ludwig in 1977. It describes a rather diffuse hair loss around the middle parting area, which is typical for androgenetic hair loss in women, but also occurs in about a fifth of affected men.

Stages

Hamilton-Norwood scheme.

The typical course of androgenetic hair loss begins temporally (on the temples ) and frontally (on the forehead ). Later the hair thins out in the area of ​​the vertex (upper back of the head) until the bald area finally extends over the entire top of the skull. A wreath of hair from above the ears around the entire back of the head is usually retained.

  • Type I: No or very little receding of the frontal hairline.
  • Type II: Frontal and temporal hair loss, formation of triangular regions without hair on the temples ( receding hairline ), does not extend beyond an imaginary connecting line two centimeters in front of the external auditory canals .
  • Type III: receding hairlines extend posteriorly (towards the back of the head) beyond the connecting line in front of the auditory canals; Minimum level for "baldness".
  • Type III (vertex or crown): hair loss mainly in the crown area, frontal hair loss mostly in stage I or II, does not exceed stage III.
  • Type IV: Further hair loss in the crown area, frontal hair loss exceeds stage III, zones are separated from one another by a clear hair band.
  • Type V: Zones of pronounced hair loss on the front and on the crown are only separated from each other by a narrow zone of hair, the hair on the temple and back of the head takes on a "horseshoe shape" (also types VI and VII)
  • Type VI: Areas of hair loss in the forehead and crown region have merged, lateral (towards the sides) expansion of the hairless areas.
  • Type VII: Only a narrow band of the original hair growth remains, which extends from the ears around the back of the head.

For types II to V there is a subdivision into A and V variants. In the A-variants there is only a straight, progressive, frontal hair loss; with the V variants, the hair also shrinks in the area of ​​the vertex. A highly controversial attempt to explain the typical sequence of hair loss is tension hair loss .

Web links

Individual evidence

  1. ↑ JB Hamilton: Patterned loss of hair in man; types and incidence. In: Ann NY Acad Sci. Volume 53, No. 3, Mar 1951, pp. 708-728. PMID 14819896
  2. ^ OT Norwood: Male pattern baldness: classification and incidence. In: South Med J. Vol. 68, No. 11, Nov 1975, pp. 1359-1365. PMID 1188424
  3. ^ E. Ludwig: Classification of the types of androgenetic alopecia (common baldness) occurring in the female sex. In: Br J Dermatol . Volume 97, No. 3, Sep 1977, pp. 247-254. PMID 921894
  4. ↑ Hereditary Hair Loss - Androgenetic Alopecia. In: MedizInfo. January 1, 2007, accessed January 1, 2007 .