ObjectiveTo investigate the short-term effectiveness of free radial head reconstruction of coronoid process, artificial radial head replacement, and ulna olecranon internal fixation in the treatment of the complex terrible triad of the elbow.MethodsRetrospective analysis was made on the clinical data of 12 patients with complex terrible triad of the elbow treated with free radial head reconstruction of coronoid process, artificial radial head replacement, and ulna olecranon internal fixation between April 2011 and April 2018. There were 8 males and 4 females with an average age of 44.5 years (range, 26-62 years). The causes of injury included 5 cases of traffic accident, 7 cases of falling from hight. The Regan-Morrey classification of ulnar coronoid process fractures was type Ⅲ; Mason classification of radial head fractures was type Ⅲ in 7 cases and type Ⅳ in 5 cases. The time from injury to operation was 5-14 days, with an average of 6.0 days. The operation time, intraoperative blood loss, and complications were recorded. After operation, X-ray film of elbow joint was reexamined, fracture healing condition was observed, and fracture healing time was recorded. The flexion, extension, and rotation of the elbow joints on the healthy and affected sides were recorded and measured. The elbow function was evaluated according to Mayo elbow function score.ResultsThe operation time was 90-140 minutes (mean, 110 minutes); the intraoperative blood loss was 100-300 mL (mean, 150 mL). None of the patients had vascular injury during the operation. One patient developed numbness in the ulnar nerve innervation area and recovered completely after symptomatic treatment for 1 week. All the 12 patients were followed up 12-22 months, with an average of 16 months. At last follow-up, the fracture healed completely, 1 patient developed ectopic ossification of elbow joint, and 2 patients developed traumatic arthritis of elbow joint. No internal fixation-related complications occurred. There was no significant difference in the range of motion of elbow flexion, extension, pronation, and supination between the affected and healthy sides (P>0.05). The median Mayo elbow function score was 96, and the interquartile range was (94, 97), and the excellent and good rate was 91.7%.ConclusionFor patients with complex terrible triad of the elbow with ulna coronoid process fractures of Regan-Morrey type Ⅲ and radial head fractures of Mason type Ⅲ, Ⅳ combined with ulna olecranon fractures, the free radial head reconstruction, artificial radial head replacement, and ulna olecranon internal fixation, through active rehabilitation function exercise after operation, can achieve more satisfactory short-term effectiveness.