The morphology of sagittal alignment in asymptomatic volunteers of East China: A novel radiological classification

There were two subgroups of sagittal plane in normal population. The optimal cut-off values of maxTK, maxLL and PI as indicators for classification of sagittal alignment were projected to be 37°, 52° and 49°, respectively. This novel classification could provide guidelines for our further understandings of sagittal alignment and mechanisms of different spinal diseases more easily, which also help to restore sagittal balance in the correction surgery more accurately.