Swelling and pressure in the elbow is a common condition in hospitals, and the most common form of swelling and pressure in the elbow is tennis elbow. The medical name for tennis elbow is epicondylitis of the humerus. It is so called because tennis players are prone to this disease. Housewives, bricklayers, carpenters and other people who repeatedly exert themselves on the elbow for a long period of time are also susceptible to this disease. Due to long-term strain, some tendons and soft tissues attached to the elbow joint can be partially torn or damaged, or the periosteum can be traumatized due to friction, causing osteochondritis dissecans. Tennis elbow is mostly caused by the forearm extensor muscle group due to long-term repeated strong contraction, pulling, so that the tendon attachment occurs in different degrees of acute and chronic cumulative injury, resulting in tearing, bleeding, mechanization, adhesion, and thus cause disease. If the tennis elbow is in the advanced stage or persistent tennis elbow, after six months to one year of regular conservative treatment, the symptoms are still serious, affecting the life and work can be taken surgical treatment. There are minimally invasive arthroscopic surgeries and less invasive open surgeries, which aim to remove necrotic and unhealthy tissues, improve or rebuild local blood circulation, and heal tendons and bones.