Epicondylitis of the humerus, commonly known as tennis elbow. The main clinical manifestations are pain on the lateral side of the elbow joint, aggravated by clenching the fist with force and forearm rotation and elbow extension movements (such as towel twisting and sweeping, etc.), and localized pressure pain in several places, without abnormal appearance. Epicondylitis of the humerus, commonly known as tennis elbow, is a painful inflammation of the tendons on the outside of the elbow. The pain is caused by repetitive force on the muscles responsible for dorsal extension of the wrist and fingers. Patients may feel pain on the outside of the elbow when gripping or lifting objects with force. Epicondylitis of the humerus, however, sometimes coexists with cervical spondylosis, in which case there may be neck pain and discomfort, numbness in the tips of the fingers, or muscle atrophy of the hand in addition to the pain in the epicondyle of the humerus. Sometimes epicondylitis of the humerus exists together with compression of the deep or superficial branch of the radial nerve, in which case the patient may experience weakness of the dorsal extension of the wrist or numbness of the dorsal region of the hand or the muzzle area. In general, simple epicondylitis of the humerus is not accompanied by numbness in the dorsal region of the tiger’s mouth and impaired wrist dorsal extension, and there is no impaired elbow joint movement, and the lateral epicondyle of the humerus has obvious pressure points. Tennis elbow is a classic example of an overuse syndrome. Studies have shown that the wrist extensors, especially the radial short wrist extensors, are under very high tension when performing wrist straightening and exerting force to the radial side, and are prone to overstretching of some of the fibers at the myofascial junction, forming a slight tear. I. Examination There is no localized redness or swelling on examination, and joint function is not limited. There is limited pressure pain on the lateral epicondyle of the humerus. Careful examination may reveal sensitive pressure points. 1. Extensor tendon pull test (mills’ sign) The elbow is straightened, the fist is clenched and the wrist is flexed. Then rotate the forearm forward, it is positive if it can induce sharp pain on the lateral side of the elbow. Humerus traumatic condylitis due to myofasciitis, the pain is obvious when doing this test. 2, X-ray examination X-ray film is generally no abnormal performance. If the disease is long, periosteal reaction can be seen, and there are calcification deposits near the lateral epicondyle of the humerus. Treatment It is not difficult to diagnose this disease, but it is difficult to treat it. Rest and change of activity patterns Appropriate rest is especially important in the acute phase (severe redness, swelling and pain), but changing activity patterns is even more important. Identifying the cause of the injury and making changes accordingly can slow down the condition. Physical therapy Rest, immobilization, elevation, electrotherapy and elbow patches can control inflammation and allow the tendon to heal in a favorable environment. Anti-inflammatory drugs can help reduce pain and inflammation. 4. Local closure Choosing local steroid injection is also an effective method for some patients who have no contraindications. Surgery Surgery may be considered if the symptoms do not improve after non-surgical treatment or if they recur. Selection of extensor tendon starting point stripping release surgery or cardinal neurovascular bundle resection. Surgery will mainly be the beginning of the extensor tendon and microvascular nerve bundle excision, or the extensor muscle of the lateral epicondyle of the humerus end point to do subperiosteal stripping. The surgery is operated under local anesthesia, without hospitalization, simple surgery, small blow to the patient, the surgical method has a certain degree of efficacy, so for long-term chronic epicondylitis of the humerus patients may wish to use surgical treatment.