Two factors are operant in the crown of hair loss restoration candidates:
1. The crown, or top of head, is
circular in shape so as Male Pattern Baldness advances, the crown radius increases. The area of the crown hair loss
increases exponentially since it is equaled to πr2 as seen in the image below.
To see how this affects the demand on the number of
follicular units required to achieve thin, medium and dense coverage of the
crown see the table below:
Effect of Crown Diameter on area
Crown Diameter (cm)
Crown area (cm²)
% Change
# fu (T,M,D)
10
78.5
-
1570
2747
3925
12
113
44
2260
3955
5650
14
154
36
3080
5390
7700
2. Part of the crown is vertical so it becomes a billboard;
with light hitting it appears thinner and see-through. Flat surfaces like the
mid scalp and frontal zones can benefit from the shingling effect, hence less
density is necessary.
But it is not as simple as just that, because Male Pattern Baldness, "MPB", can be
chronically progressive, one has to leave a safe buffer reserve in case it is
in the genes of the hair restoration patient.
That is not to say, crown restoration should not be
attempted as it can be a viable hair loss treatment. A Crown Hair Transplant can be done safely and effectively in the proper patient as long as proper
informed consent is given regarding the above operant factors. In the wrong
patient hair islands can be created. These result when the crown is restored
and subsequent hair loss creates a zone of alopecia hair loss around the island transplant. Again, hair characteristics play a pivotal role in hair restoration outcomes and should be discussed with your hair restoration professional.
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