Introduction – Fracture of femur neck is the most common fracture among elderly patients. There are various methods of fracture fixation with different complications. The aim of present study is to assess the complications in Fracture neck of Femur in elderly patients treated by Cemented Bipolar prosthesis. Material and methods- The present retrospective study was conducted at department of orthopaedics of Sri Ram Murti Medical College , Barielly among 100 elderly patients who had undergone repairment surgery of fracture neck of femur bone by cemented bipolar prosthesis during the past one year. Demographic and surgical data was gathered and analyzed using SPSS version 25.0. Results – The maximum patients (67%) were from the age group of 60 to 70 years. Female (68%) were more in number as compared to male (32%). According to gardens classification 57% had type III injury and 43% had type IV. 67% patients were operated in the first 48 hours itself. 24% patients were operated within the 1st week . Average injury surgery interval was 2.99 days. Majority of the surgeries (55%) performed were completed within 40-50 minutes. The general complications in our study were bed sore , pulmonary embolism, superficial infection, DVT and deep infection whereas the specific complications were posterior dislocation, acetabular erosion, intra op fracture and loosening. Conclusion – For femur neck fractures, cemented bipolar hemiarthroplasty provides a fair rate of complications along with increased mobility, pain alleviation, and a quicker return to independent operation.