Typical radiographs showing quite the opposite change in spinopelvic sagittal alignments. (a) A 46-year-old female with a large change in sacral slope. Features: posterior rotation of the pelvis and lumbar kyphosis in the relaxed seated position. (b) A 78-year-old female patient with a small change in sacral slope. Features: anterior rotation of the pelvis and lumbar lordosis in the relaxed seated position.