BACKGROUND. The maximum number of hair grafts that can be safely implanted in 1 cm 2 is still debatable. To our knowledge, no previous report has addressed this issue in three dimensions, taking into account the size, the angle of the graft, and the intergraft distance.OBJECTIVES. To study the effect of the size and angle of the graft and the intergraft distance on dense packing. METHODS. Using a mathematical formula (the maximum number of hair grafts in 1 cm 2 = 33 * cosine ␣), the volume of the recipient area and the volume of the hair graft are calculated, assuming that the surface area of the recipient area is 1 cm 2 , the diam-eter of the hair graft is 1 mm, and the intergraft distance is 1.5 mm laterally and 1 mm anteriorly and posteriorly.RESULTS. The maximum number of hair grafts that could be implanted in 1 cm 2 at a 90Њ angle in relation to the skin surface is 33 grafts, at a 60Њ angle is 28 grafts, and at a 30Њ angle is 16 grafts.CONCLUSION. The maximum number of hair grafts that can be implanted in any given recipient area depends on the graft size, the angle or direction of these grafts, and the intergraft distance. Where more space is allowed between the grafts, and the more acute the angle, the fewer hair grafts that can be implanted.
The maximum number of hair grafts that can be implanted in any given recipient area depends on the graft size, the angle or direction of these grafts, and the intergraft distance. Where more space is allowed between the grafts, and the more acute the angle, the fewer hair grafts that can be implanted.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.