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[Effectiveness of improved elbow anteromedial approach in treatment of ulna coronoid process fracture].

Objective: To observe the effectiveness of reduction and fixation by the improved elbow anteromedial approach in treatment of ulna coronoid process fracture.

Methods: Between January 2010 and December 2014, 13 patients with the ulna coronoid process fracture were treated with reduction and fixation by the improved elbow anteromedial approach. There were 10 males and 3 females with an average age of 37.2 years (range, 18-57 years). Five cases were caused by traffic accident, 7 cases by falling injury from height, and 1 case by object impact injury. Seven cases were the terrible triad of the elbow, 4 cases were the ulna coronoid process and radial head fractures, 1 case was the proximal radius and ulna fractures, and 1 case was the ulna coronoid process and distal radius fractures. According to Regan-Morrey classification criteria, the ulna coronoid process fracture was rated as type Ⅱ in 2 cases and as type Ⅲ in 11 cases. According to O'Driscoll classification criteria, 10 of the 13 cases were anterior coronoid fracture (8 cases of type Ⅱb, 2 of type Ⅱc), and 3 of basal fracture. The operation time, amount of intraoperative bleeding, postoperative complications, range of motion (ROM) of the elbow joint, Mayo elbow function index (MEPI) score and fracture healing time were recorded.

Results: The average operation time was 38.7 minutes (range, 30-55 minutes), and the average amount of intraoperative bleeding was 109.3 mL (range, 90-160 mL). All incisions healed at stage Ⅰ. There was no iatrogenic vascular or nerve injury. All patients were followed up 13-24 months (mean, 16.9 months). All fractures achieved clinical healing. The average healing time was 11.2 weeks (range, 8-16 weeks). There were 2 cases of heterotopic ossification. At last follow-up, the ROM of elbow flexion was 119-145° (mean, 132.4°); the ROM of elbow extension was -8-15° (mean, 7°). The ROM of forearm pronation was 68-90° (mean, 78.6°), and the ROM of forearm supination was 76-90° (mean, 84.3°). At last follow-up, the MEPI score was 70-100; and 9 cases were excellent, 3 cases were good, and 1 case was fair. The excellent and good rate was 92.3%.

Conclusion: Improved elbow anteromedial approach for the ulna coronoid process fracture can not only avoid the injuries of surrounding blood vessels and nerves, but also perform fracture reduction and fixation under direct vision. It is a safe, simple, and effective treatment method for the ulna coronoid process fracture.

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