Follicular unit extraction (FUE) is the technique that has defined modern hair transplant surgery. Understanding precisely what it involves — the instruments, the process, and the principles behind it — helps patients approach the procedure with genuine clarity about what will be happening.
A follicular unit is a naturally occurring group of one to four hair follicles that emerge from the same point on the scalp and share a common connective tissue sheath. In normal scalp, follicular units are visible under magnification as clusters of adjacent hairs sharing a root structure. The natural grouping of follicular units is what gives normal hair its characteristic appearance — single hairs at the hairline, pairs and triplets slightly further back, providing a graduated density transition.
FUE extraction involves using a small circular punch — typically 0.7 to 0.9 millimetres in diameter — to cut around each individual follicular unit, severing its attachments to the surrounding tissue. The follicular unit is then lifted with fine forceps. The key skill in extraction is matching the punch to the angle and direction of the follicle beneath the surface — most follicle damage in FUE occurs when the punch does not accurately follow the follicle path, transecting the follicle instead of cleanly separating it.
After extraction, each graft is examined under magnification and sorted by follicular unit size — single, double, triple, or quadruple. Singles are typically reserved for the hairline transition zone; larger units provide coverage for the mid-scalp.
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