The results of surgery for Dupuytren's disease were prospectively assessed to see if there is a correlation between hand function, the degree of deformity and the post-operative result. A total of 42 patients were followed-up for 6 months. The mean flexion deformity was 81 degrees pre-operatively and 32 degrees post-operatively. The mean Sollerman score improved from 71 (out of 80) pre-operatively to 77 post-operatively. There was a significant correlation between the degree of deformity and the Sollerman score, and also between the improvement in deformity after surgery, and the Sollerman score. We conclude that hand function is worsened by increasing deformity in Dupuytren's disease and improved by correction of the deformity.