With the rapid development of China’s construction and transportation industries in recent years, the incidence of traumatic elbow joint injuries has been increasing year by year, especially high-energy injuries. In 1996, Hotchkiss referred to the posterior dislocation of the elbow joint accompanied by fracture of the radial head and ulnar coronoid process as the “terrible triad of the elbow”. Because it is a high-energy injury, this type of injury is often combined with radial ligament or joint capsule injury, resulting in extreme instability of the elbow joint, which makes treatment difficult. Even now, some primary care hospitals still only pay attention to fracture displacement, but not to elbow stability restoration, and after treatment, it is generally difficult to maintain elbow stability and tend to dislocate again. Complications such as elbow joint instability, stiffness, heterotopic ossification, ulnar nerve entrapment, traumatic osteoarthritis of the joint, and even loss of elbow joint function occur later. With the in-depth study of the biomechanics of the elbow joint and the gradual understanding of the role of the ulnar coronoid process in the stability of the elbow joint, combined with clinical follow-up, it was found that the elbow joint was well recovered and stability was more important. 2002 Ring et al. and Pugh et al. made a detailed report on this injury type, discussing its treatment and prognostic outcome. In 2003, O’Driscoll proposed a more detailed O’Driscoll’s classification based on the location, size and mechanism of injury of the coronoid fracture. O’Driscoll believed that the stability of the humeral ulnar joint must be maintained with three conditions: an intact articular surface, an intact anterior medial collateral ligament bundle, and a radial collateral ligament complex. This new concept of traumatic orthopedics was introduced in 2005 by Zhang Shimin et al. It is a revolutionary improvement in the diagnosis and treatment level of the elbow joint triad. 2009, through clinical and biological research, Liao Su et al. found that the bone structure and soft tissue support each account for 50% of the dynamic stability and static stability of the elbow joint. With the efforts of many predecessors, most scholars currently believe that for the treatment of this injury, ① Coronoid fractures with bone ingrowth or affecting the stability of the elbow joint are given internal fixation through the bone channel or internal fixation with steel pins or plates.? (ii) internal fixation of the radial head fracture or metal prosthesis replacement to restore the stability of the lateral column; (iii) repair of the lateral collateral ligament and related structures and repair of the medial collateral ligament if necessary or application of a movable hinged external fixation brace to assist in fixation. For coronoid fractures, the application of anchor nailing for internal fixation or routine exploration and repair of the medial collateral ligament still needs to be further explored. However, the diagnosis is now generally referred to as elbow triad. We have treated 17 patients with this type of injury since 2008, and the diagnosis and treatment are summarized as follows. ①Elbow dislocation, which is more likely to be accompanied by coronoid process avulsion fracture, should be treated with CT scan if necessary for those with more severe injury and obvious swelling to prevent missed diagnosis. ②Elbow dislocation combined with coronoid process fracture, after repositioning, there is still obvious instability of the elbow joint, and the prognosis is better if surgery is chosen. (3) Minimally invasive operation should be emphasized during surgery, and appropriate surgical approach and internal fixation should be used according to the type of fracture, and the joint capsule and soft tissues attached to the bone should not be peeled off to prevent osteoid myositis; this type of fracture is often combined with soft tissue injury, and both should be taken into account, and intraoperative attention should be paid to the repair of the joint capsule and medial and lateral collateral ligaments to strengthen the stability of the elbow joint. ④ According to the intraoperative elbow joint stability recovery, postoperative external fixation in plaster for 2-3 weeks or movable hinged external fixation brace assisted fixation, oral indomethacin was given to prevent heterotopic ossification. Under the guidance of the doctor, early functional exercises were performed on the affected elbow autonomously or with the assistance of the healthy limb to avoid various postoperative complications of the elbow joint.