The aim of pilonidal sinus surgery includes complete resection of the lesion and filling of the resultant soft-tissue defect by some means; this has a major influence on whether a lesion will occur after surgical treatment. The creation of a sacral adipofascial turn-over flap for the excisional defect has been performed in seven cases of pilonidal sinus since November of 1992. During the postoperative follow-up period, which ranged from 10 months to 7 years 11 months (mean duration, 5 years 2 months), partial dehiscence of the wound as a result of fatlysis was observed and treated conservatively in one case; however, primary healing was obtained in the other cases. No recurrence was seen in any of the seven cases. This procedure is not indicated in patients in whom wide skin resection is required because of the excessive tension associated with skin closure in such cases. However, the method is convenient, less invasive, and reliable, and therefore considered to be useful in the treatment of pilonidal sinus.