The basic concepts of the wound healing are primary closure, secondary intension skin graft, and flap surgery, The rapid advancement of the medicine and the operative technology enables each operation to improve that the concept of the wound healing is required to be the satisfactory cosmetic result rather than simple wound healing.
In covering the skin defect, the flap surgery is superior to the skin graft in that the former provides more excellent color and texture than the latter, but the local flap from the small donor site has the problem of the restriction of the donor site and the scar according to the Barter´s principle. Especially, in the case of the scalp defect, traditions methods such as hair graft or local flap have been used to treat the baldness, but they were restricted by the locality and the hair loss of the donor site. Since the introduction of the expansion technique by Radovan in 1957, the use of it has shown more excellent result than any other technique already used and has made it possible to cover the recipient site without the loss of hair in donor site of the scalp. We implanted the tissue expanders of crescent, round, rectangular forms in the subgleal space in 11 cases of 8 salp defect patients due to burn, trauma, and congenital disease and gradually expanded them by infusion of 10-15 % of total volume at each Lime, 1-3 times a week after 2or3 weeks postoperatively. After 3-5 month of expansion, we could cover the scalp defect by the expanded scalp. We saw partial necrosis and transitional noninflation in two cases, but we succeeded to cover the scalp with the normal hair-bearing scalp in all the 11 cases,
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