Fig. 2From: Accuracy of intraoperative estimation of femoral stem anteversion in cementless total hip arthroplasty by using a digital protractor and a spirit levelDuring trial stem insertion, the femur was internally rotated with knee flexion. Three methods for estimating the stem anteversion were performed sequentially. Method A by visual estimation (a); method B by a digital protractor alone (b); and method C by a digital protractor combined with a spirit level (c)Back to article page