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KMID : 1037220230290020097
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Archives of Aesthetic Plastic Surgery
2023 Volume.29 No. 2 p.97 ~ p.101
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Hair diameter measurement methods: micrometer caliper versus phototrichogram
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Park Jae-Hyun
Ho Yeh-Hong
Kotchamol Manonukul
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Abstract
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Background : Hair diameter is a crucial element in deciding the treatment and predicting the prognosis of hair transplantation in patients with hair loss.
Methods : Ten female volunteers participated in this study. Three sites at different horizontal positions of the scalp were chosen for measurement: midoccipital, mastoid, and temporal. Three boxes of 1 cm2 were marked from superior to inferior along the midline of each site, and five anagen hairs ≥10 cm long were randomly sampled from each box. The thickness of each collected hair was measured at three positions along the hair length: 1 cm, 5 cm, and 10 cm from the surface of the skin. The diameters of the hairs were measured using a micrometer caliper and a Folliscope phototrichogram, and the measurements were compared.
Results : The average thickness of all hairs was 76.90±12.29 μm when measured with the caliper and 108.78±19.97 μm when measured with the phototrichogram. There was a statistically significant difference between the two measurement methods (P<0.001). The average hair thickness from the three areas (midoccipital, mastoid, and temporal) showed a significant difference between the caliper and the Folliscope hair measurements (P<0.001): midoccipital area (caliper, 74.46±9.71 μm; Folliscope, 109.03±19.59 μm), mastoid area (caliper, 76.36±10.67 μm; Folliscope, 103.73±18.67 μm), and temporal area (caliper, 79.89±15.18 μm; Folliscope, 113.59±20.43 μm).
Conclusions : Measuring hair thickness using a phototrichogram, which generates a measurement of the long-axis dimension, is clinically useful in the treatment of patients with hair loss and patients undergoing hair transplantation.
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KEYWORD
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Hair follicle, Transplantation, Transplant donor site
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