Horizontal Correction of Scoliotic Deformity with High-Density Pedicle Screw Constructs: A Retrospective Analysis of 40 Patients

• Published in: Surgical Case Reports pp. 1 - 8
• Main Authors: Debaud, Charlotte, Felter, Adrien, Hayek, Georges, Loubresse, Christian Garreau de
• Format: Journal Article
• Language: English
• Published: 10.11.2020
• ISSN: 2613-5965; 2613-5965
• DOI: 10.31487/j.SCR.2020.11.07

Purpose: To report radiologic outcomes in the horizontal plane after scoliosis correction with high-density pedicle screw constructs through a sterEOS®-3D analysis. Methods: We conducted a retrospective monocentric study on scoliotic patients who underwent a surgical correction with high-density constructs. SterEOS®-3D reconstructions were modelled from pre and postoperative EOS® acquisitions. Amplitude of surgical correction and residual deformity were analysed for rotational parameters (vertebrae vectors coordinates, apical vertebral rotation (AVR), intervertebral rotations, Torsion Index) and transversal offset parameters (Spread of Coronal Offsets (SCO), mean of coronal offsets (CO), T9 and L3 to Gravity Line (GL) CO, T9/L3 Transverse Gravitational Deviation Index (TGDI), T9/L3 TGDI θ categories). Results: 80 sterEOS®3D reconstructions were analysed. Paired t-test comparisons between pre and postoperative values showed a significant reduction for Cobb angles (p<0.0001) and AVR (p = 0.0024) but not for TI (p = 0.69). 51% of the curves with a preoperative AVR > 10° were corrected at a segmental level with an average de-rotation amplitude of 19.3° +/- 8° and 56% at a global level with an average de-torsion index of 54% +/- 30%. Correction of SCO was effective for 95% of patients with a mean amplitude of 30mm +/- 10mm and was associated with a significant reduction in T9 and L3 to GL CO (34mm ± 24mm and 7.6mm +/-10mm respectively). Conclusion: Horizontal corrections achieved with high-density constructs in scoliosis surgery are more significant on translation than rotation at a segmental and global level.