There are many controversies concerning therapeutic guidelines for the treatment of Kienbock's disease. We experienced 7 cases of stage III Kienbock's disease, which were treated with triscaphe arthrodesis form March 1983 to Marth 1987. 1. There were 2 males and 5 femsles and 6 cases were occured before the age of 40. 2. Dominant hand was affected in 5 cases. 3. Dorsiflexion injury was related with this disease in 2 cases. 4. The mean duration from symptom on-set to operation was 2 years and 3 months. 5. All patients were followed for at least 6 months and the average was 1 year 9 months. 6. Pain was relieved in all cases, but range of motion wss not improved after operation.