Internal Fixation for Unstable Distal Ulnar Fractures by 2.7 mm Semitubular Hook Plate.

Objective: The purpose of this study is to investigate the outcomes of the use of a 2.7 mm semitubular hook plate for internal fixation of unstable metaphyseal ulnar fractures. Methods: Between January 2015 and July 2019, 30 consecutive patients with a recent unstable distal ulnar fracture were included in this prospective case series. All patients were subjected to follow-up with the time of union, range of motion, pain using a Visual Analog Scale (VAS), and radiological and functional outcome using the quick Disabilities of the Arm, Shoulder, and Hand (DASH) score and Mayo wrist score after 12 months. Results: The mean age of the patients was 45.3 ± 10 years. There were 18 males (60%) and 12 females (40%), and there were 16 patients associated with distal radius fractures (53.33%). According to the AO classification of distal ulnar fractures, 3 fractures were type A2.1 (10%), 9 were type A2.2 (30%), 8 fractures were type A2.3 (26.67%), and 10 fractures were type A3 (33.33%). All fractures have been united with a mean duration of 9 ± 1.4 weeks, the mean supination was 81.4° ± 3.5°, the mean pronation was 81.3° ± 4.5°, the mean flexion was = 71.7° ± 3.6°, and the mean extension was = 81.7° ± 3.4°. The mean VAS was 1.1 ± 1 points, the mean DASH score was 9.3 ± 5.6 points, and the mean Mayo wrist score was 88.5 ± 7.2 points; 17 patients were excellent (56.67%) and 10 patients were good (33.33%) while 3 patients had satisfactory outcome (10%). Conclusion: Using the 2.7 mm semitubular hook plate is a successful choice for internal fixation of unstable distal ulnar fractures isolated or associated with distal radius fractures with a favorable union time, functional outcome, and range of motion with minimal complications.