Figure 3

Seated lumbopelvic lateral radiograph (a) and illustration (b). The horizontal distance between the vertical line drawn from the ASIS and the upper edge of the midline marker was measured as the X-value, and the vertical distance between the horizontal line drawn from the ASIS and the upper edge of the midline marker was measured as the Z-value (c). The lap belt angle was measured as the angle between the straight line connecting the upper edge of the markers and the horizontal line (d). Lumbar lordosis (LL) was defined as the angle between the first lumbar superior endplate and the first sacral superior endplate, and sacral slope (SS) was defined as the angle between the first sacral superior endplate and the horizontal line, were measured for the lumbopelvic alignment (e).