Abstract
When calculating the transection rate in follicular unit extraction (FUE), many surgeons evaluate only the removed graft and do not consider damages that may occur in the donor site punch wound. Two to four study boxes were marked on the donor strip, and eight follicular units were harvested from each study box using FUE. FUE was performed by an expert for ten patients and by a beginner for ten additional patients. After the strip was harvested, each study box was separated, and two cross sections were cut along the punched line. Follicular units obtained from each study box were analyzed under a 20-power digital video microscope, and we found various transections through this analysis. Among them, some transections were hidden under the scalp surface, keeping the shaft alignment. We named this occurrence “hidden transection.” While the two surgeons harvested with similar transection rates, there was a significant difference in their hidden transection rates: 2% for the expert and 8% for the beginner. The main finding of this study is that a correct way to calculate the real-transection rate in FUE is to consider both extracted follicular transection and hidden transection.
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