Purpose The purpose of this study is to compare the clinical outcome and the rate of reoperations in a cohort of patients with undisplaced femoral neck fractures treated with internal fixation and patients with displaced femoral neck fractures treated with hip arthroplasty.

Methods In a consecutive series of patients we compared the results of internal fixation for undisplaced femoral neck fractures with those of hip arthroplasty for displaced fractures (control group) of elderly patients. Risk of reoperation and patient reported hip function assessed with Harris hip score and WOMAC were used as outcome measurements.

Inclusion Criteria:

Above 65 years old Displaced femoral neck fracture treated with hip arthroplasty Undisplaced femoral neck fracture treated with internal fixation

Exclusion Criteria:

• Pathologic fracture

To evaluate the potential benefit of surgery with arthroplasty. All patients treated at Sundsvall hospital, Sweden for a displaced femoral neck fracture treated with hip arthroplasty or a undisplaced femoral neck fracture treated with internal fixation were included in a prospective cohort study.

If researchers requests data - anonymous data will be shared.