Preoperative radiological parameters to predict clinical and radiological outcomes after laminoplasty

Su Hun Lee, Dong Wuk Son, Jun Jae Shin, Yoon Ha, Geun Sung Song, Jun Seok Lee, Sang Weon Lee

Research output: Contribution to journalReview articlepeer-review

1 Citation (Scopus)


Many studies have focused on pre-operative sagittal alignment parameters which could predict poor clinical or radiological outcomes after laminoplasty. However, the influx of too many new factors causes confusion. This study reviewed sagittal alignment parameters, predictive of clinical or radiological outcomes, in the literature. Preoperative kyphotic alignment was initially proposed as a predictor of clinical outcomes. The clinical significance of the K-line and K-line variants also has been studied. Sagittal vertical axis, T1 slope (T1s), T1s-cervical lordosis (CL), anterolisthesis, local kyphosis, the longitudinal distance index, and range of motion were proposed to have relationships with clinical outcomes. The relationship between loss of cervical lordosis (LCL) and T1s has been widely studied, but controversy remains. Extension function, the ratio of CL to T1s (CL/T1s), and Sharma classification were recently proposed as LCL predictors. In predicting postoperative kyphosis, T1s cannot predict postoperative kyphosis, but a low CL/ T1s ratio was associated with postoperative kyphosis.

Original languageEnglish
Pages (from-to)677-692
Number of pages16
JournalJournal of Korean Neurosurgical Society
Issue number5
Publication statusPublished - 2021 Sept

Bibliographical note

Funding Information:
This study was supported by Research institute for Convergence of biomedical science and technology (30-2018-020), Pusan National University Yangsan Hospital.

Publisher Copyright:
© 2021 The Korean Neurosurgical Society.

All Science Journal Classification (ASJC) codes

  • Surgery
  • Neuroscience(all)
  • Clinical Neurology


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