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Purpose:The aim of present study is to evaluate the outcome of bone marrow instillation at the fracture site in fracture of intracapsular neck femur treated by head preserving surgery.Methods:This study included 32 patients of age group 18-50 years with closed fracture of intracapsular neck femur.Patients were randomized into two groups as per the plan generated via www.randomization.com.The two groups were Group A (control),in which the fracture of intracapsular neck femur was treated by closed reduction and cannulated cancellous screw fixation,and Group B (intervention),in which additional percutaneous autologous bone marrow aspirate instillation at fracture site was done along with cannulated cancellous screw fixation.Postoperatively the union at fracture site and avascular necrosis of the femoral head were assessed on serial plain radiographs at final follow-up.Functional outcome was evaluated by Harris hip score.Results:The average follow-up was 19.6 months.Twelve patients in each group had union and 4 patients had signs of nonunion.One patient from each group had avascular necrosis of the femoral head.The average Harris hip score at final follow-up in Group A was 80.50 and in Group B was 75.73,which was found to be not significant.Conclusion:There is no significant role of adding on bone marrow aspirate instillation at the fracture site in cases of fresh fracture of intracapsular neck femur treated by head preserving surgery in terms of accelerating the bone healing and reducing the incidence of femoral head necrosis.