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Lateral body radiographs with corresponding diagrams demonstrating worsening sagittal balance with compensatory pelvic retroversion and knee flexion. Note change in acetabular anteversion corresponding to changes in global body alignment. From: Hu J, Qian BP, Qiu Y, et al. Can acetabular orientation be restored by lumbar pedicle subtraction osteotomy in ankylosing spondylitis patients with thoracolumbar kyphosis? Eur Spine J. 2017; 26(7):1826–1832
