Cervical Sagittal Alignment Limited Adjustment After Selective Posterior Thoracolumbar/Lumbar Curve Correction in Patients With Lenke Type 5C Adolescent Idiopathic Scoliosis:

Abstract A retrospective clinical and radiographic study. To analyze the radiographic change in CSA and identify the possible factors influencing the postoperative CSA in selective posterior TL/L curve correction. The correlation between the CSA and thoracic sagittal alignment (TSA) is a well-recognized phenomenon in patients with thoracic idiopathic scoliosis. However, little has been published about the influence of thoracolumbar/lumbar (TL/L) curve instrumentation on CSA. Thirty patients with Lenke type 5C AIS received the selective posterior TL/L curves fusion by pedicle screws. Preoperative and postoperative radiographic and clinical parameters were analyzed. C2-C7 lordosis less than 0 was considered a lordotic cervical spine, whereas more than 0 was considered a kyphotic cervical spine. Preoperatively, 43% of patients showed a kyphotic cervical spine (KCS), whereas the remaining 57% showed a lordotic cervical spine (LCS). C2-C7 lordosis was correlated with T1-slope, thoracic kyphosis (TK), and global-TK (Gl-TK) (P