Follicular Unit Survival
The survival of follicular units upon extraction from the scalp is one of the key variables of successful hair transplantation. If follicular units are transected in the extraction process, there is a greater likelihood that they will not survive the transplant, and the hair transplant will fail. While FUT procures using strip-harvesting of follicular units typically guarantees a large number of non-transected follicular units, FUE procedures can, and often do, transect grafts, rendering them useless in a transplant. Significant efforts have been made to reduce the rate of transection in FUE procedures. The skill of the surgeon and his/her team, and the type of instrumentation used, are major factors in the ultimate yield and viability of the follicular units. Graft survival is also affected by time out of the scalp and exposure to air(especially in vacuum extraction devices). Different methods have been proposed to further improve graft survival affected by these later factors mainly by removing capture devices and adding/increasing time on ice.
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