The surgical outcome of Dupuytren's disease was evaluated in 73 hands of 57 patients in a Japanese population. Subtotal fasciectomy was performed in all cases. Surgical results were evaluated using the percentage improvement of extension in each finger joint. Statistical analyses were performed on the risk factors associated with recurrence and extension. The surgical outcome depended on the degree of contracture of the proximal interphalangeal joint. Recurrence of disease occurred in eight patients (14%) and extension occurred in nine (16%). Recurrence and extension frequently occurred in those who had ectopic lesions or involvement of the radial side of the hand. The present results suggested that the Dupuytren's diathesis had an influence on recurrence and extension. We proposed a new classification of Dupuytren's disease that might help to predict the surgical outcome and facilitate surgical planning.