الفهرس 
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Abstract
Introduction: Instability after hip replacement is a devastating issue, dual mobility articulations (DMC) have proven to be a reliable pathway to address post-operative dislocation after hip replacement in recent FNFs. Aim of Work: The primary aim behind this work is to compare between cemented and uncemented dual mobility total hip arthroplasty (THA) in our cases; cases of recent femoral neck fractures presenting in Mansoura University Emergency Hospital (MUEH). Patients and methods: The study is a combined retrospective and prospective study that is performed on elderly patients (above 55 years) admitted to Mansoura University Emergency Hospital (MUEH) with recent femoral neck fracture, in the period from January 2018 to January 2021. our study over a series of 101 patients with recent FNF, 64 patients underwent cemented DMCs (63.37%) while 35 patients underwent uncemented DMCs (34.63%). Two patients underwent hybrid DMTHA. Results: The study included 61 females versus 40 males, 13 patients had stroke, while 12 patients had cognitive disorders. Mean age was 69.07 years, mean age of women was higher than men. Mean cup size was 48, while mean stem size was 10. Mean follow up duration was 26.35 months. At the end of follow up duration, dislocation rate was 1.98%, while intra-prosthetic dislocation rate was 0.99%. Post-operative mortality rate was 1.98%. Conclusion: Dual mobility total hip arthroplasty is an excellent option for managing FNFs in elderly, specially with high risk of instability. Good clinical and radiological outcomes were found, with preference of cemented DMC in age group older than 55 years. It must be noted that using dual mobility articulation does not forgive incorrect implant positioning, thus, proper planning and proper implant positioning is mandatory. Keywords: Femoral neck, Fractures, Emergency, Dual Mobility, Hip, Arthroplasty