There are many baldness patterns in male occurs during people’s life. Many of young men start losing hair from 20 years old without a clear reason that way we are losing hair in this age.
Likely the reason behind hair loss in this age is due to a genetic factors. Where research has shown that genetic factors are responsible for 95% of baldness cases.
In 1950s a scientist called (James Hamilton) has classified the male pattern baldness to eight ranges starting from range one to range eight and called “Hamilton scale”.
But in 1970s this scale was revised and updated by O’Tar Norwood and became known as Hamilton-Norwood scale or simply the Norwood scale.
Norwood-Hamilton classification system
Hamilton studied more than 300 males with hair loss, and proposed a detailed classification system based on front parietal and frontal recessions and frontal thinning, which consisted of eight evolutionary aspects and three subgroups.
The various categories of hair loss described by Hamilton include
- scalps, which aren’t bald (Types 1-3)
- scalps, which are bald (Types 5-8)
Which are defined as follows:
There is an absence of bilateral recessions along the anterior border of the hairline in the front parietal regions. In this, there is a variant form in which the entire anterior border of the hairline lies high on the forehead.
The anterior border of the hairline in the front parietal regions has triangular areas of recession, which tend to be symmetric a I and extend no farther posteriorly than a point “3 cm” anterior to a line drawn in a coronal plane between the external auditory meatuses. Hair is also lost, or sparse, along the midfrontal border of the scalp but the depth of the affected area is much less than in the front parietal regions.
Borderline cases were listed separately like Type 3, which also included scalps in which classification is rendered inaccurate due to scars, lateral asymmetry in denudation, unusual ranges of sparseness and thinning of the hair, and other factors.
It represents the minimal hair loss considered sufficient to represent baldness. There are deep frontotemporal recessions, often symmetrical, and are either bare or so sparsely covered by hair. These recessions extend farther posteriorly than a point, which lies (3 cm) anterior to a coronal line, drawn between the external auditory meatuses. If hair is sparse or lacking as a broad band along the entire anterior border of the hairline.
It involves extensive front parietal and frontal recessions with a sparseness or absence of hair on the crown.
In this range, the tonsural region of alopecia remains separated from more anteriorly located zones of denudation by a laterally-directed bar of scalp in which the hair is only slightly sparse. An island of hair lies in the midline anterior to this laterally-directed hairy bridge. In the variant type, pattern VIA, the peninsula or island of mid-frontal hair is sparse or lost.
Range VII and VIII:
In these ranges, horseshoe-shaped area of sparse hair or of denudation is unbroken by any well-haired, laterally-directed bridge of scalp. These are a result of the spread and confluence of the tonsural and the anteriorly located regions of alopecia.
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