Background: Displaced midshaft clavicle fracture treated by surgical stabilisation. To prevent changes of nail migration we have used a screw intramedullary device in which screw head of nail get hold in medial side. The aim of the study is to analyse the role of SIMN in midshaft clavicle fracture and to observe the complications associated with this procedure Material and Methods: The study include 20 patients (16M & 4F median age of 26.3 years, ranging from 16yrs to 60 years) who underwent and faced a displaced clavicular fracture. The follow up was of 6 months. The CMS & ASES scoring were used to determine the functional outcome of the patients Results: 10% union was achieved. The union time was 1.3 weeks. The average CMS and ASES scoring at 6 month was 93.60 & 94.65 respectively. 1 patient had medial nail protrusion and required nail removal after union. Conclusion: SIMN is safe and simple minimal invasive technique with minimal complications and have good patient satisfaction. And provide excellent cosmetics and functional outcome.