| Summary: | Background: Fractures of the medial clavicle are uncommon. There is no consensus regarding the optimal treatment of displaced medial clavicle fractures. Methods: A systematic review using Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines was performed. PubMed, EMBASE, and the Cochrane Library were queried using the terms medial clavicle and fracture to identify all studies reporting on outcomes following either nonoperative or operative treatment of displaced medial clavicle fractures. Data extracted included patient demographics, fracture classification, surgical technique, patient-reported outcomes, physical, and radiographic findings. Study quality was evaluated using the Methodological Index for Non-Randomized Studies (MINORS) scoring system. Results: The analysis included 15 studies (mean MINORS score, 10 ± 1.5) with a total of 135 patients (85% male, mean age 47 ± 10.9 years [range, 15-87 years]). Five studies (39 patients) reported outcomes following nonoperative treatment. At a mean follow-up of 27 months, there were 5 (13%) symptomatic nonunions, 2 (5%) malunions, and 2 (5%) delayed unions. Eleven studies (96 patients) reported outcomes following surgical treatment with a mean follow-up of 23 months. There were no reported nonunions. Complications included plate prominence/ irritation (30%) and additional surgery was performed for plate removal (27%), fixation failure (3%), and wound débridement (1%). Conclusion: There is limited, low-quality evidence in the literature to guide treatment of displaced medial clavicle fractures. The available data suggest that surgical treatment is associated with good functional outcomes and a lower risk of nonunion and malunion, compared to nonoperative treatment but plate irritation and further surgery to remove the plate was common.
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