Background: The follicular unit excision (FUE) technique has become the preferred method for hair transplants over the traditional strip harvest technique due to low scar visibility and shorter recovery time for the patient. However, a limitation of the FUE technique is the potential for graft trauma due to the small diameter, sharp punches used to harvest individual follicular units.
Aims: Here, we introduce the novel edge out FUE punch that is designed with a thicker wall and has an internal bevel. We describe how the dynamics of this punch reduces the risk of follicle transection.
Methods: A review of the available literature and information on the edge out punch in comparison with other punch shapes, as well as the authors' experience in this area, is provided.
Results: The edge out punch is designed with thick walls and an internal bevel, placing the sharp cutting edge on the outer diameter. The dynamics of this punch aid in directing the graft into the center of the punch lumen and keeps the sharp cutting edge away from the hair follicles deeper in the dermis, reducing the risk of follicle transection.
Conclusion: The dynamics of the forces generated by the edge out punch aid in minimizing follicular transections during graft harvesting. By understanding the dynamics behind this novel punch, hair restoration surgeons (HRSs) can optimize their surgical technique to obtain consistently high-quality grafts during FUE.
Keywords: FUE; FUE punch dynamics; edge out punch; hair transplant.
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