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Hair exits the scalp in a bundle with one to three other hairs. The term follicular unit refers to these bundles. The image below is a microscopic view of follicular units in a .25 cm square as they occur in nature.

Physician's Hair Institute's procedure

(Ultra Refined Incisional Follicular Unit Grafting and DFU)

Dr. Keene uses the most advanced and effective technique of hair transplantation in the world. We remove permanent hair follicles on the sides and back of the scalp that are not affected by male pattern baldness, and employ them as donor follicles. These permanent donor follicles are then transplanted in follicular units of 1-4 hairs (the way hair grows naturally) on the crown and front of the scalp. By using follicular units of 1-4 hairs, as they appear in nature, we avoid producing unsightly "corn rows" or other unnatural effects associated with hair transplant surgeries using grafts of 6 or more hairs. We also utilize double follicular units (DFUs) for added density with fewer incisions. We limit DFUs to 3 to 4 hairs per graft. During our procedure, grafts are placed very close together, since too much space between groupings looks unnatural. Custom blades are used to allow high density.

Double Follicular Units (DFU's) are 3-4 haired grafts that have a slight gap between groupings, but that can be placed closer together when not cut down into smaller 1 and 2 hair follicular unit grafts. The advantage is that more density can be created with fewer graft and incisions, which means a less costly hair transplant to the patient. It also results in less trauma, due to fewer incisions being required to place the same numbers of hairs.

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