“…Altogether, the 43 studies investigated comprised 7688 patients with humeral shaft fractures. Eleven studies were randomised controlled trials (level II; 25.6%) (19, 20,21,22,23,24,25,26,27,28,29), 5 were prospective non-randomised case-control studies (III; 11.6%) (30,31,32,33,34), and 27 were retrospective cohort studies (IV; 62.8%) (6,8,9,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58). Twentyseven studies compared IM with ORIF (6,19,20,22,24,25,26,27,…”