Transplant procedure is performed on an outpatient basis in the hospital. Under sterile condition, and local anesthesia the donor scalp is harvested.
Generally there are two techniques for harvesting hair follicles, each with their own advantages and disadvantages, follicular unit extraction (FUE), and Strip harvesting. Regardless, technique has been used, proper extraction of the hair follicle is essential to ensure the viability of the transplanted hair. Hair follicles grow at a slight angle to the skin’s surface, so transplanted tissue must be removed at a corresponding angle.
1.Follicular unit extraction (FUE)
With this technique, individual follicular units containing 1 to 4 hairs are; this is performed by using tiny punches of between 0.6mm and 1.0mm in diameter. The surgeon then uses very small micro blades or fine needles to puncture the sites for receiving the grafts, placing them in a predetermined density and pattern, and angling the wounds in a consistent fashion to promote a realistic hair pattern. Recently we started using the hair gun to implant the hair follicles in the skin without the need for puncture FUE takes place in a single long session or multiple small sessions. The FUE procedure is more time consuming than strip surgery. An FUE surgery time varies according to the surgeons experience, speed in harvesting and patient characteristics. The procedure can take anywhere from a couple to 8 hours , depending on the number of hair grafts The advantage of FUE harvesting is no linear incision on the back of the head and it doesn’t leave a linear scar, so no suture removal is required. The final result looks very natural.
Recovery time from Micro Grafting FUE is usually less than 7 days.
Disadvantages are more times needed for the procedure and higher cost to the patient. It requires high skill and expertise from the surgeons because the procedure is physically demanding and the learning curve to acquire the skills necessary is lengthy and tough.
Strip harvesting is used to be the most common technique for removing hair and follicles from a donor site. The surgeon harvests a strip of skin from the posterior scalp, in an area of good hair growth. The strip size is about 1–1.5 x 15–30 cm. Then the surgeon or his team begins to dissect individual follicular unit grafts from the strip. Then they clean excess fibrous and fatty tissue in a careful way to avoid damage to the follicular cells. Currently we apply ‘Trichophyte closure’ which results in much finer scars at the donor area.
Finally the surgeon uses fine needles to puncture the sites for receiving the grafts, he has to place them in a predetermined density and pattern, and angling the wounds in a consistent fashion to promote a normal hair pattern.
Disadvantages of Strip harvesting are thin linear scar in the donor area, which is typically covered by a patient’s hair even at relatively short lengths, longer recovery period which is around 2 weeks, and the need for stitches/staples removal by medical personnel.