Surgical management of intracapsular fracture neck femur by hemiarthroplasty between uncemented bipolar prosthesis and Austin Moore’s prosthesis: a comparative study in elderly population

Background: Intracapsular femoral neck fractures are common in elderly population after a simple fall. To avoid the drawbacks of internal fixation and for the early mobilization, hemiarthroplasty is performed in elderly. The aim of this study is to compare the outcome AMP with uncemented bipolar prosthesis in geriatric patients.Methods: 51 patients above 60 years and an acute displaced fracture of the femoral neck were randomly allocated to treatment by either AMP (Austin Moore prosthesis) or bipolar hemiarthroplasty, in the Department of Orthopaedics, Sri Siddhartha medical college, Tumkur between April 2014 and May 2017. The patients were summoned at 6 weeks, 12 weeks, 6 months and 1 year. Functional outcome was assessed and compared with modified Harris hip score and radiological parameters.Results: The mean Harris hip score in bipolar and AMP group was 86.31±12.1 and 79.86±15.42, respectively (p=0.182). The range of motion was 204.52±28.2 and 183.62±36 (p=0.014) respectively. Functional activities like use of public transport and ability to wear shoe or socks was better with bipolar group. Incidence of complications like painful hip, posterior dislocation, periprosthetic fracture and acetabular erosion was encountered in AMP group.Conclusions: The use of uncemented bipolar endoprosthesis in the management of displaced femoral neck fractures in the elderly was associated with better mean Harris hip score and incidence of complications was limited. Hence, bipolar would be a better option in elderly patients with fracture neck of femur.