One hundred and twenty six patients undergoing unilateral total hip arthroplasty (THA) were randomly assigned to receive either an augmented reality (AR) -based portable navigation system (n=62) or an accelerometer-based portable navigation system (n=64) during surgery. The primary outcome was the absolute difference between the cup placement angle shown on the navigation system screen and the angle measured on postoperative radiographs. Secondary outcomes included intraoperative or postoperative complications and were assessed immediately after surgery. The study found no significant difference in radiographic inclination angles between the two groups, but the AR group showed a smaller absolute difference in radiographic anteversion angles compared to the accelerometer group. Given this information, the authors do not recommend widespread use of these systems in clinical practice at this time.