Is distal locking screw necessary for intramedullary nailing in the treatment of humeral shaft fractures? A comparative cohort study

{Purpose The gold standard for intramedullary nailing (IMN) in humeral shaft fracture treatment is bipolar interlocking. The aim of this study was to compare clinical and radiographic outcomes in two cohorts of patients treated with IMN with or without distal interlocking. We hypothesized that there was no significant difference between isolated proximal interlocking and bipolar interlocking in terms of consolidation and clinical results. Methods One hundred twenty-one acute humeral shaft fractures were retrospectively included in group WDI (without distal interlocking screw