Background: Femoral neck fracture is an established public health concern globally owing to longer life expectancy especially that femoral neck fractures and hip fractures in general are more common in older population.

Objective: The aim of the present study was to evaluate the clinical and radiological outcome results of total hip arthroplasty after displaced neck femur fractures.

Patients and methods: This interventional clinical trial included 18 elderly patients with displaced neck femur fractures who attended the Orthopedic department, Faculty of Medicine, Zagazig University Hospitals. Modified Harris Hip Score (MHHS) was evaluated pre and post operatively.

Results: The mean age of the studied group was 62.6±1.8 years. The average post-operative MHHS was 78.7±18.6. There was a statistically significant improvement in the MHHS score. There was significant difference regarding modified Harris hip pain scores pre and postoperatively for patients with neck femur fractures. There was high significant difference regarding modified Harris functional hip score for activities pre and postoperatively. Most of patients didn't have any postoperative complications, one case had a dislocation (5.6%), one case had a Periprosthetic fracture (5.6%) and one case had a superficial infection (5.6%).

Conclusion: THR is an effective technique for management of displaced neck femur fractures in active elderly people.