Twenty-eight patients (30 cases of epicondylitis) were operated between January 2007 and January 2008. There were nine men and 19 women whose mean age was 46.1 years. A preoperative EMG found anomalies in the deep posterior interosseous nerve in all cases. Patients were divided into two groups: one group of patients recognized as having an occupational disease and a group of patients whose disease was not considered occupation-related.