Hair Transplantation

Excerpt

Historically, androgenic alopecia was treated with techniques such as plug grafts, scalp reductions, and transposition flaps. Today, hair transplantation is the standard surgical approach, which involves harvesting follicular units from the patient's occipital scalp. This method provides a more natural and fuller appearance. Androgenic alopecia, also known as male pattern hair loss and female pattern hair loss, is the most common indication for this procedure. Achieving successful results depends on selecting appropriate candidates.

A thorough understanding of alopecia types and the ability to distinguish among them is essential. Hair loss disorders are typically classified into 3 categories—cicatricial or scarring alopecia, nonscarring alopecia, and structural hair disorders. Cicatricial alopecias cause permanent hair loss by irreversibly halting the hair growth cycle. Nonscarring alopecias spare the follicle, allowing for spontaneous or treatment-induced regrowth. Structural disorders cause the hair shaft to become fragile and prone to breakage.

Ideal candidates for hair transplantation typically present with a clear, stable pattern of hair loss, characterized by at least 50% thinning or balding in 1 or more areas. The scalp must be healthy, with donor hair of good quality and quantity. Patients must have realistic expectations and be free of medical conditions that compromise surgical outcomes. The safe donor zone is located in the mid-occipital region between the upper and lower occipital protuberances, typically containing 65 to 85 follicular units/cm². Hair with larger shaft diameters provides greater surface coverage, giving thicker-caliber hair an advantage for achieving denser results. Donor areas with over 80 follicular units/cm² are excellent candidates, whereas densities below 40 units/cm² are considered less suitable. Because occipital hairs are resistant to androgens, transplanted hairs retain their donor characteristics, including caliber.

Patients aiming to correct frontal baldness often achieve the most dramatic, lasting results. Grafting only the scalp vertex should generally be avoided, as this can prematurely use donor grafts and risk creating a doughnut appearance with future loss. Clinicians should stress designing a conservative, natural hairline to ensure a lasting, realistic result. Individuals with light skin and light hair typically benefit from less contrast, making coverage appear fuller even with fewer grafts. In contrast, darker hair on lighter skin requires greater precision.

Clinicians should review the possible risks of hair transplantation, such as infection, scarring, graft failure, unnatural hairlines, and temporary shock loss. Thorough counseling and shared decision-making are crucial for establishing realistic expectations about coverage and density. A patient-centered approach that combines surgical skills with clear communication enhances satisfaction and supports better long-term outcomes.

During the procedure, clinicians transfer androgen-resistant follicular units from the occipital region to areas of balding. The 2 primary methods are follicular unit transplantation and follicular unit extraction. Follicular unit extraction is often preferred for younger patients and those seeking shorter hairstyles, as it avoids a linear donor scar. The donor site is 1 of the primary limiting factors, regardless of technique. When needed, alternative donor sites, such as the parietal scalp, submental region, chest, and other body areas, can be used; however, their efficacy is less well studied, and hair characteristics may differ significantly from those of scalp hair. For individuals who are not ideal surgical candidates, nonsurgical options such as minoxidil, finasteride, dutasteride, low-level laser therapy, platelet-rich plasma, adenosine, and ketoconazole can help slow hair loss and stimulate regrowth.