Tennis elbow is common, and offen disabling problem even in daily living;conservative treatments commonly make satisfactory results, but recurrence is frequent and discouraging. So, surgical treatments are considered in certain cases. The authors report the retrospective analysis of 15 patients treated by nirschl and pettrone procedure. Patients were evaluated with Nirschl and Pettrone assessment method at an average 10.3 months(range, 5 to 32 months0 after surgery. thirteen of 15(87%) patients had more than fair postoperative rating. Two patients had postoperative complications;one with infection and the other with transient mild limitation of elbow motion. No postoperative deterioration of the clinical state was seen. And biopsy specimens of all case showed degenerative changes. Resection of the degenerated site of tendon origin of the humeral epcondyle(The Nirschl and Pettrone procedure) yield satisfactory results in properly selected patients.