Background: Unstable osteoporotic intertrochanteric fracture of femur are challanging to manage because of poor bone quality and difficult reduction .Internal fixation in these patients is associated with complications related to recumbency due to prolonged immobilization.The purpose of this study to analyse outcome of hemiarthroplasty in Unstable intertrochanteric fracture femur Objective: To Evaluate functional outcome of hemiarthroplasty in unstable intertrochanteric fracture femur using Harris Hip Score Material and methods: A retrospective and prospective study was carried out on 22 patients with unstable intertrochanteric fracture femur. Fractures were classified according to AO/OTA and Evans classification. Patients were treated with Cemented Bipolar prosthesis Results: Out of 22 patients, 14 (63.6 %) were males and 08 (36.4 %) were females. The most common age group was between 71 - 90 years in which females were more affected. The most common fracture type was Evans type 3and 4 and AO/OTA 31 A-2.2 /2.3. The end results based on Harris Hip Score Functional end results were 45% excellent, 35% good and 20% fair . There were no poor result. Conclusion: Primary bipolar hemiarthroplasty provides good functional outcome according to Harris hip score in elderly unstable osteroporotic intertrochanteric fracture femur however long term follow up is required.