The author had the opportunity to treat a large number of patients with lateral epicondylitis during the last 30 years. At first, lateral epicondylitis is treated conservatively. If this fails, an operation is performed consisting of excision of lateral epicondyle with debridement of the lateral compartment of the elbow and reattachment of the origin of the extensor tendons. The elbow is immobilized in a posterior splint for about two and a half weeks, and after three weeks, active exercises begin. Among the 150 cases, 110 were males and 40 females. The right upper extremity was involved in 100 cases and the left upper extremity in 50 cases. the lateral epicondylectomy and debridement were evaluated from two to ten years from the time of injury. Results were as follows: excellent 70%, good 25%, and fair 4%.