Coronoid tip fractures in terrible triad injuries can be safely treated without fixation.

INTRODUCTION: The optimal treatment of terrible triad injuries of the elbow (TTI) remains topic of ongoing discussion. The aim of this study was to determine whether different treatment strategies for coronoid tip fractures in terrible triad injuries influences the clinical and radiological results in a mid-term follow-up.

METHODS: A total of 62 patients with surgical treatment of a TTI including a coronoid tip fracture (37 women, 25 men; mean age, 51 years) were available for follow-up assessment after an average of 4.2 years (range 24-110 months). Thirteen patients had O'Driscoll 1.1 and 49 O'Driscoll 1.2 coronoid fractures, of which 26 were treated with and 36 without fixation. Range of motion, the Mayo Elbow Performance Score (MEPS), Oxford Elbow Score (OES), and Disabilities of the Arm, Shoulder and Hand (DASH) score as well as grip strength were evaluated. Radiographs were analyzed for all participants.

RESULTS: No significant benefit in outcome variables could be detected between patients, whose coronoid had been fixed, compared to patients without fixation of the coronoid. In the coronoid fixation group, patients had mean outcome scores of 81.5 ± SD 19.1 (range 35-100) for MEPS, 31.0 ± SD 12.5 (range 11-48) for OES and 27.7 ± SD 23 (range 0-61) for DASH score, while in the no-fixation group, mean MEPS was 90.8 ± SD 16.5 (range 40-100), mean OES was 39.0 ± SD 10.4 (range 16-48) and mean DASH score was 14.5 ± SD 19.9 (range 0-48). Mean range of motion was 116° ± SD 21° (range 85-140°) versus 124° ± SD 24° (range 80-150°) in extension-flexion and 158° ± SD 23° (range 70-180°) versus 165° ± SD 12° (range 85-180°) in pronation-supination. Overall complication rate was 43.5% and revision rate was 24.2%, with no significant differences between both groups. Suboptimal results were more frequently seen in patients who had degenerative or heterotopic changes on their latest radiograph.

CONCLUSIONS: Sufficient elbow stability and good outcomes can be achieved in most patients with TTI and coronoid tip fractures. Although some bias in treatment allocation and group heterogeneity cannot be completely omitted, our analysis detected no significant benefit in outcome when the coronoid tip fracture has been fixed compared to patients with non-fixed coronoid tip. Therefore, we would suggest a no-fixation approach for coronoid tip fractures as primary treatment in TTI of the elbow.

LEVEL OF EVIDENCE: Level III, retrospective comparative study.