Analysis of the Changes in Scalp Hair Angles: In Vivo and In Vitro Comparison Before and After Tumescence

April 2018 in “ Journal of Cosmetic Dermatology ”

Anas Malik, Mohammad Humayun Mohmand

tumescence scalp hair angles strip hair restoration xylocaine adrenaline hair transection follicular unit extraction FUE tumescent fluid lidocaine epinephrine

Studysummary This study found that hair shaft exit angles in patients undergoing strip hair restoration increased after the tumescence injection and further increased after strip excision.

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The study, which included ten patients undergoing their first session of strip hair restoration, aimed to determine the effect of tumescence on scalp hair angles. Measurements were taken before and after the injection of 0.5% xylocaine with adrenaline, and again after the hair strip was removed. The findings indicated that the average hair angle increased from 52.82° before injection to 65.34° after injection, and to 71.91° after the hair strip was excised. The research concluded that tumescent fluid significantly alters hair angles, increasing them by approximately 19.09°, which could potentially reduce hair transection during follicular unit extraction (FUE) and lessen surgeon fatigue. Understanding hair angles is essential for optimizing hair restoration surgery outcomes.

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