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Background and Objectives:Surgeons comonly employ osteotome and rasp to remove the bony hump of the nasal dorsum in reduction rhinoplasty. The thicknes of skin-soft tissue envelope and nasal bone is not consistent in nasal dorsum. Therefore, thicker superior nasal bone. Manual rasps can cause avulsion injury of upper lateral cartilage and soft tissue trauma. So we introduced a powered instrument (microdebrider) in reduction rhinoplasty to improve precision and technical ease while mi-nimizing tissue trauma. Subjects and Method:We operated on eleven patients either with hump nose only (N=6) or deviated nose with hump (N=5)only for 5 cases and microdebrider after osteotome for 6 cases to smoothen the dorsal edges of open roof after osteotome. We used the powered instrument XPS 2000 Microresector system for rhinoplsty (XOMED). Results:Ten patients were satisfied with the results subjectively. Bony irregularity of the nasal dorsum was not observed and we found les eccyhmosis and edema compaired with the usage of rasp. Conclusion:in a more precise and limited fashion in reduction rhinoplasty with reduced complication than rasp. (Korean J Otolaryngol 2002;45:781-3)