A Scoping Review on Complications in Modern Hair Transplantation: More than Just Splitting Hairs

Background

Hair restoration surgery (HRS) is a commonly performed elective procedure but to date lacks a review of the full scope of complications.

Objectives

To provide a comprehensive overview of observed complications associated with follicular unit extraction (FUE) and follicular unit transplantation (FUT).

Eligibility Criteria

Randomized control trials, cohort studies, case series, and case reports published in 1985 or later on adults (age>18). Nontraumatic or autoimmune etiologies of alopecia were excluded as procedure indications.

Sources of Evidence

PubMed, EMBASE, Cochrane databases (last search December 31, 2022).

Charting Methods

Data-charting and extraction were independently performed with two reviewers using Covidence.

Results

Forty-three publications were included. Two large series reported the overall complication rate to be 1.2 and 4.7%. Common complications included bleeding requiring intervention (up to 8%), persistent numbness (up to 11%), infection (up to 11% with two reports of Kaposi varicelliform eruptions and one of mucormycosis), effluvium at donor and recipient sites (up to 4.1% and 6.5%, respectively). The most common donor-site complication was hypertrophic scarring/keloid formation after FUT (up to 15.1%). Complications at the recipient site, including crusting (up to 54.8%), frontal edema (up to 50%), and sterile folliculitis (up to 53.3%), tended to be poorly defined with a broad range of incidences.

Conclusion

Serious complications associated with HRS are rare in the hands of experienced providers. However, comprehensive discussions of risk must be had with prospective patients as any complication in the context of an elective procedure may be significant and psychologically devastating for the individual patient.

Level of Evidence V

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