Fig. 1From: How much does lumbar fusion change sagittal pelvic tilt in individuals receiving total hip arthroplasty?The SPT angle, which is the angle between the vertical line (purple dotted line) and the line connecting the pubic symphysis and the center of the anterior superior iliac spine (orange line) in the standing position, was divided to three categories: anterior tilt (positive value), neutral (zero degree), and posterior tilt (negative value)Back to article page