Distribution of Human Hair in Follicular Units

    April 1999 in “ Dermatologic Surgery ”
    Francisco Jiménez, Jose M. Ruifernández
    Image of study
    TLDR The research found that for a typical hair density, about 11 square centimeters of donor scalp is needed to get 800 hair grafts for transplantation.
    The study, involving 50 patients, investigated the distribution of follicular units in the human occipital scalp to aid in planning follicular unit transplantation. It found that follicular unit density ranged from 65 to 85 units per square centimeter, with hair density between 124 and 200 hairs per square centimeter. A mathematical model was developed to estimate the donor size needed for transplantation, predicting the total number of follicular units and their composition in terms of 1-, 2-, and 3-hair units. The model suggests that for an average hair density of 160 hairs/cm², at least 11 cm² of donor scalp is required to harvest 800 follicular units. The study highlights the necessity of individual measurements due to variability among patients and acknowledges a potential graft loss of 10 to 30% during harvesting and dissection. The findings are specific to a Spanish population and may not be generalizable to other groups.
    Discuss this study in the Community →

    Related Community Posts Join

    6 / 171 results
      Diffuse hair loss and scalp biopsies

      community Diffuse hair loss and scalp biopsies

      in Research  692 upvotes 4 months ago
      Scalp biopsies are crucial for diagnosing hair loss conditions like Diffuse Unpatterned Alopecia (DUPA) and retrograde hair loss, as treatments like finasteride and dutasteride may not be effective if other conditions are present. Combining PPAR-GAMMA agonists with retinoids could improve treatments for conditions like Lichen Planopilaris.

      community Verteporfin and Microneedling

      in Treatments 6 months ago
      Clinical studies by Dr. Barghouthi and Dr. Bloxham indicate that Verteporfin, when used with FUE and FUT hair transplantation methods, shows promise in hair follicle regeneration and minimal scarring due to its ability to inhibit Yes-associated protein (YAP). Microneedling at depths of 3-3.5mm, combined with Verteporfin, could potentially reactivate dormant follicles, although the optimal dosage and application method are still under investigation. Concerns remain about the DHT sensitivity of regenerated follicles, highlighting the need for further research to optimize trauma levels and Verteporfin concentrations to achieve effective and scar-free hair regeneration.

      community Hair Cloning, Trials were supposed to begin 2020-2021

      in Technology  48 upvotes 4 years ago
      The conversation discusses hair cloning trials expected to start in 2020-2021 and mentions concerns about potential delays due to the Coronavirus. Treatments like Minoxidil, finasteride, and RU58841 are referenced.

    Related Research

    4 / 4 results