June 2024 in “Indian Journal of Plastic Surgery/Indian journal of plastic surgery” This study found that using a specific ratio method based on the patient's scalp measurements can effectively predict the dimensions of the permanent safe zone for hair transplants, particularly in early stages of androgenetic alopecia, potentially ensuring long-lasting transplant results.
14 citations
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May 2014 in “Archives of plastic surgery” This study found that among Korean males with male pattern baldness, hair loss mostly progresses within 6 cm from the parietal whorl towards the occipital side.
2 citations
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January 2019 in “PubMed” This study examined the follicular unit density in the scalp and beard donor areas of Indian men undergoing hair restoration surgery, reporting mean densities of 78.2/cm² and 49.7/cm² respectively, and proposed guidelines for safe follicular unit extraction.
10 citations
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July 2017 in “Archives of Plastic Surgery” This study found that hair diameter varies significantly within the occipital safe donor area, with thicker hair in the upper sections and thinner hair in the lower sections.
9 citations
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April 2017 in “International Journal of Dermatology” This study found significant differences in hair diameter between males and females across different zones of the safe donor area, which may aid in selecting optimal donor regions for hair transplantation surgeries.