We asked whether intraoperative use of imageless navigation ( 1 ) improves the relative accuracy of leg length and global and femoral offset restoration ; ( 2 ) increases the absolute precision of leg length and global and femoral offset equalization ; and ( 3 ) reduces outliers in a reconstruction zone of 5 mm for leg length and global and femoral offset restoration compared with intraoperative fluoroscopy during minimally invasive ( MIS ) THA with the patient in a lateral decubitus position .