Fig. 4

Meta-analysis of aperture coronal plane position. A Perpendicular to BL measured on 3DCT by quadrant method (Higher percentage is defined as lower aperture location). B Along AP axis measured on 3DCT by anatomic coordinate axis method (Higher percentage is defined as more posterior aperture location). C Along AP axis measured on axial MRI by clock face method (Higher degrees is defined as more anterior aperture position). (c + m): combined conventional and modified TT groups. (AM + OI): combined AM and OI groups