There are many controversies concerning therapeutic guidelines for the treatment of Kienbock's disease. We experienced 17 cases of stage II or III Kienbock's disease(Lichtman's classification), which were treated with triscaphe fusion from March 1983 to March 1992. The mean Follow-up peri- od was 25 months. The purpose of this study is to evaluate the clinical and radiological result of triscaphe fusion of 17 cases of Kienbock's disease. 1. The pain was relieved in all cases, but range of motion was not improved after operation. 2. The postoperative results of triscaphe fusion were evaluated by Licthman's method. 9 cases (53%) were rated as satisfactory and 8 cases as unsatisfactory. 75%(3 cases of 4) were rated sat isfactory in IIIA a group and 22%(2 casaes of 9) were rated satisfactory in IIIB group. 3. The psudoarthrosis was noted in 2 cases of 17.