Lumbar lordosis is signficantly greater on intraoperative prone X-ray than on preoperative standing or supine images: a retrospetive study of lordosis measurement from the United States

Approximately 10° of additional LD is generated by prone positioning under anesthesia, compared with standing or supine preoperative imaging. Among patients with greater sagittal imbalance, the increased LD suggested they can achieve more correction through positioning. These values should be considered when estimating the amount of lordosis needed to achieve sagittal alignment through surgical maneuvers.