Fig. 4From: Accuracy of a portable accelerometer-based navigation system for cup placement and intraoperative leg length measurement in total hip arthroplasty: a cross-sectional studyCup positions relative to Lewinnek safe zone [2] in the new version group. The number of cups inside the Lewinnek safe zone was 51/55 (93%) and 56/60 (93%) in the previous version group and new version group (P = 0.592). Results of previous version group were from our previous study [24]Back to article page