Patients scheduled for a primary arthroplasty were approached for the study. Inclusion criteria are as follows: (1) unilateral traumatic femoral neck fracture, (2) primary hip replacement, (3) age > 18 years old at time of surgery, (4) cementless straight stem (Johnson & Johnson/Zimmer Biomet, USA), and (5) able to get a preoperative and postoperative CT scans. Exclusion criteria are as follows: (1) hip joints had abnormalities before this injury and (2) condition deemed by physician to be nonconductive to patient's ability to complete the study. Demographic information collected on all patients was age, gender, and body mass index (BMI).

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