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We measured the PI–LL and disc angle at the level undergoing LIF on FBB films (A), plain radiographs immediately after LIF in the prone position (B), and plain radiographs after PCO and PSF in the prone position (C). PI–LL, pelvic incidence–lumbar lordosis; LIF, lateral lumbar interbody fusion; FBB, fulcrum backward bending; PCO, posterior-column osteotomy; PSF, posterior spinal fusion.
