Sun Bensen, Zhang Shu, Pradhan Sushmita, Zhao Wenbin, Xu Yuxian, Zhang Xinyi, Diao Yongfeng, Jiang Xian
The Department of Dermatology, West China Hospital of Sichuan University , Chengdu, China.
Chengdu Hengmei Hair Medical Beauty Hospital , Chengdu, China.
J Cosmet Laser Ther. 2020 Apr 2;22(3):137-140. doi: 10.1080/14764172.2020.1761550. Epub 2020 May 7.
The rise in the incidence of androgenetic alopecia (AGA) in China has increased the inclination toward hair transplantation. To calculate the optimum density of hair follicles needed covering both the hairless area and the safe donor area (SDA), 119 male patients with AGA were recruited into this multicenter investigation. We evaluated the mean diameter and the number of hair follicles (HFs) and follicular units (FUs) in the SDA of AGA. The mean density of HFs was 137.45 ± 30.11 hair/cm and the FUs was 76.82 ± 12.09 FUs/cm. The mean diameter of the hair was 0.97 ± 0.01 mm in the SDA. We obtained the decisive factors in the restoration of the scalp by building a geometric model and summarizing it in a new formula. This study showed that the length and direction of the hair play a vital role in restoring the bald area with hair transplantation. The density of 55.00 ± 10.00 hair/cm (30.00 ± 5.00 FUs/cm) for the transplanted area and no less than 106.88 hair/cm (60.00 FUs/cm) for SDA is regarded as an optimum parameter for hair transplantation of AGA.
中国雄激素性脱发（AGA）发病率的上升增加了人们对毛发移植的倾向。为了计算覆盖无毛区和安全供区（SDA）所需的最佳毛囊密度，119例AGA男性患者被纳入这项多中心研究。我们评估了AGA患者SDA中毛囊（HFs）和毛囊单位（FUs）的平均直径和数量。HFs的平均密度为137.45±30.11根/平方厘米，FUs为76.82±12.09个/平方厘米。SDA中毛发的平均直径为0.97±0.01毫米。我们通过建立几何模型并将其总结为一个新公式，得出了头皮修复的决定性因素。这项研究表明，毛发的长度和方向在毛发移植修复秃发区中起着至关重要的作用。移植区密度为55.00±10.00根/平方厘米（30.00±5.00个/平方厘米），SDA密度不低于106.88根/平方厘米（60.00个/平方厘米）被视为AGA毛发移植的最佳参数。
