Tennis elbow (humeral epicondylitis) is the most common disease of the elbow, and the onset of the disease is often seen in manual laborers, domestic workers, tennis players, etc. It is associated with repetitive exertion of the upper limbs and excessive stretching of the tendons. Clinical manifestations include pain in the lateral aspect of the elbow, involving the upper and lower arms, decreased grip, and inability to perform manual labor or even affect daily life. MILLS test is positive. Epicondylitis is a self-limiting disease in most patients, but many patients cannot tolerate prolonged pain and dysfunction. Treatment includes rest and ice, physical therapy, nerve blocks, etc. Needle knife release is particularly effective, with its cutting, peeling and loosening of local lesions, which destroys the original limited lesions and scar tissue and promotes local blood circulation, metabolism and absorption of inflammatory substances. By stripping the scar and releasing the adhesions, the muscle ligaments can regain their dynamic biomechanical balance, thus achieving good results.