Background: Intertrochanteric fractures of the hip are common fractures in the elderly. While the incidence of these fractures has actually decreased, the absolute increase in the elderly population has led to doubling the number of these fractures over the past three decades and this trend is expected to continue. Intramedullary fixation of these fractures gained popularity in the last few years because of its biomechanical superiority over extramedullary methods moreover less blood loss, operative time, x-ray exposure and hospital stay. Method: This study was performed on forty patients with unstable intertrochanteric fractures underwent fixation with intramedullary short Gamma nail generation three. Results: Functional outcome was assessed using Parker mobility score at 6 months and one year postoperative, 31(77.5%) patients had the same score as preoperative at 6 months and increased to 87.5% at one year. The most of cases 29(72.5%) had no complications. Conclusion: Our results recommend the use of intramedullary nail in the treatment of unstable trochanteric fracture after anatomical reduction.