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Drs. Hasson & Wong
Lateral Slit Technique

Validated in Journal of Dermatologic Surgery

For the past ten years Drs. Hasson & Wong (H&W) have been performing their lateral slit technique which they claim will give a more natural appearance to the transplanted hairs. Recently a peer reviewed statistically significant study published in the Journal of Dermatologic Surgery confirmed this principle behind the famous H&W Lateral Slit Technique. The natural orientation of multi-hair follicular units is perpendicular to the direction of hair growth.

Orientation of Multi-Hair Follicles in Nonbald Men: Perpendicular Versus Parallel
Authored by Yagyu K, Hayashi K, Chang SC. Natural Hair Transplant International Research Institute, Kioicho Clinic, Tokyo, Japan.

BACKGROUND There has been much debate about the orientation of multi-hair grafts in order to obtain an appearance of fullness after the hair transplantation.

OBJECTIVES To analyze natural orientation of multi-hair follicles and the influence of hair flow from the crown swirl.

METHODS Natural orientation of follicles was analyzed microscopically in 100 nonbald men: a clockwise whorl flow group (50 men) and a counterclockwise group (50 men).

RESULTS The majority of multi-hair follicles were oriented perpendicular to the radial line from the whorl in both the groups. The percentage of perpendicular orientation was large in the peripheral and middle scalp areas (49–79%), and it decreased in the vertex (38–49%, p<.05 or .01). The percentages of parallel, right oblique, and left oblique orientation were small in the peripheral area with a slight increase in the vertex (3–12% vs. 14–24%, p<.05 or .01).

CONCLUSION Original orientation of multi-hair follicles was mainly perpendicular to the radial line from the whorl irrelevant to the crown swirl hair flow. Multi-hair grafts transplanted perpendicularly would look similar to the natural hair follicles in the front half of the scalp.

HairSite Archive: December 2007
Source: Journal of Dermatologic Surgery
Category: Hair Transplant
Article # 355
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