Internal fixation versus hemiarthroplasty for displaced femoral neck fractures in the elderly: A cost-effectiveness analysis

•An advantage of this study is the use of the cost diary, which facilitated complete and detailed data collection. We asked the patients to record all the costs so that the accuracy of this study could be ensured.•Many studies related to the costs of fracture only collected the medical costs. We used cost diary to record medical and non-medical costs which increase the integrity of cost data.•Another advantage is the application of advanced statistical methods which increase the reliability of the data.•Most researches on cost-effectiveness analysis (CEA) were conducted in western countries. Similar research has rarely been reported in China. Our study enriches the knowledge base of the research field of CEA of displaced femoral neck fractures and indicates that the final results may be not consistent across different countries.