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Cross-section Trichometry: A Clinical Tool for Assessing the Progression and Treatment Response of Alopecia
Tongyu Cao Wikramanayake1, Lucia M Mauro, Irene A Tabas
1Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida 33136, USA.
Background:
To properly assess the progression and treatment response of alopecia, one must measure the changes in hair mass, which is influenced by both the density and diameter of hair. Unfortunately, a convenient device for hair mass evaluation had not been available to dermatologists until the recent introduction of the cross-section trichometer, which directly measures the cross-sectional area of an isolated bundle of hair.
Objective:
We sought to evaluate the accuracy and sensitivity of the HairCheck(®) device, a commercial product derived from the original cross-section trichometer.
Materials And Methods:
Bundles of surgical silk and human hair were used to evaluate the ability of the HairCheck(®) device to detect and measure small changes in the number and diameter of strands, and bundle weight.
Results:
Strong correlations were observed between the bundle's cross-sectional area, displayed as the numeric Hair Mass Index (HMI), the number of strands, the silk/hair diameter, and the bundle dry weight.
Conclusion:
HMI strongly correlated with the number and diameter of silk/hair, and the weight of the bundle, suggesting that it can serve as a valid indicator of hair mass. We have given the name cross-section trichometry (CST) to the methodology of obtaining the HMI using the HairCheck(®) system. CST is a simple modality for the quantification of hair mass, and may be used as a convenient and useful tool to clinically assess changes in hair mass caused by thinning, shedding, breakage, or growth in males and females with progressive alopecia or those receiving alopecia treatment.
