TY - JOUR
AR - SCR-2020-11-107
TI - Horizontal Correction of Scoliotic Deformity with High-Density Pedicle Screw Constructs: A Retrospective Analysis of 40 Patients
AU - Charlotte , Debaud
AU - Adrien , Felter
AU - Georges , Hayek
AU - Christian Garreau de , Loubresse
JO - Surgical Case Reports
PY - 2020
DA - Tue 10, Nov 2020
SN - 2613-5965
DO - http://dx.doi.org/10.31487/j.SCR.2020.11.07
UR - https://www.sciencerepository.org/horizontal-correction-of-scoliotic-deformity-with-high-density-pedicle-screw_SCR-2020-11-107 
KW -  Scoliosis surgery techniques, high-density pedicle screw constructs, de-rotation, horizontal plane, EOS imaging
AB - 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.