Comparison between arthroscopic suture anchor fixation and open plate fixation in the greater tuberosity fracture of the proximal humerus.

INTRODUCTION: The purpose of this study is to compare the clinical and radiological outcomes of patients undergoing open reduction and internal fixation (OR/IF) using a plate or patients undergoing an arthroscopic suture anchor fixation for the greater tuberosity (GT) fracture of the proximal humerus. The purpose of this study is to compare the clinical and radiological outcomes of patients undergoing OR/IF or an arthroscopic suture anchor fixation for the GT fracture. MATERIALS AND METHODS: Between January, 2010 and December, 2020, 122 patients with GT fracture underwent operative fixation. Either OR/IF using proximal humeral locking plate (50 patients) or arthroscopic suture anchor (72 patients) fixation was performed. Fourteen patients were lost to follow-up and finally, 108 patients were enrolled in this study. We divided these patients into two groups: (1) OR/IF group (Group I: 44 patients) and arthroscopic anchor fixation group (Group II: 64 patients). The primary outcome was subjective shoulder function (shoulder functional scale). Secondary outcomes were range of motion, and complications including GT fixation failure, fracture migration, or neurologic complication. Also, age, sex, BMI, operation time, shoulder dislocation, fracture comminution, AP (anteroposterior), SI (superoinferior) size and displacement were evaluated and compared between two groups. RESULTS: Both groups showed satisfactory clinical and radiological outcomes at mid-term follow-up. Between 2 groups, there were no significant differences in age, sex, BMI, presence of shoulder dislocation or comminution. Group II showed higher clinical scores except VAS score (p < 0.05) and longer surgical times (95.3 vs. 61.5 min). Largest fracture displacement (Group I vs. II: SI displacement: 40 vs. 13 mm, and AP displacement: 49 vs. 11 mm) and higher complication rate (p = 0.049) was found in Group I. CONCLUSIONS: Both arthroscopic anchor fixation and open plate fixation methods showed satisfactory outcomes at mid-term follow-up. Among them, OR/IF is preferred for larger fracture displacement (> 5 mm) and shorter operation time However, arthroscopic anchor fixation group showed better clinical outcomes and less complications than the OR/IF group. LEVEL OF EVIDENCE: Level 4, Case series with subgroup analysis.