Asploro Journal of Biomedical and Clinical Case Reports

Asploro Journal of Biomedical and Clinical Case Reports

Rodrigo Góes Medéa de Mendonça^1iD*, Giuliana Haddad Taralli de Mendonça^1iD, Jeffrey R. Sawyer^1iD, Derek M. Kelly^1iD
1University of Tennessee-Campbell Clinic Department of Orthopaedic Surgery & Biomedical Engineering, Le Bonheur Children’s Hospital, Memphis TN, USA

Corresponding Author: Rodrigo Góes Medéa de Mendonça ^{ORCID iD}
Address: Rua Cesário Mota Junior 112, São Paulo-SP CEP 01221-020, Spine Group – Santa Casa Medical School, Brazil.
Received date: 17 July 2024; Accepted date: 15 August 2024; Published date: 22 August 2024

Citation: de Mendonça RGM, de Mendonça GHT, Sawyer JR, Kelly DM. Adolescent Idiopathic Scoliosis Treated with Simultaneous Translation on Two Rods (ST2R) Involving Preoperative, Postoperative, and Follow-Up Evaluation by EOS 3D Imaging: A Case Series. Asp Biomed Clin Case Rep. 2024 Aug 22;7(3):233-40.

Copyright © 2024 de Mendonça RGM, de Mendonça GHT, Sawyer JR, Kelly DM. This is an open-access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

Keywords: Simultaneous Translation on Two Rods, Adolescent Idiopathic Scoliosis, 3D Spinal Reconstruction, EOS Imaging, Scoliosis

Abstract

Objective: To evaluate preoperative, postoperative, and follow-up of spinal and pelvic parameters using EOS 3D imaging in adolescent idiopathic scoliosis (AIS) patients who underwent simultaneous translation on two rods (ST2R) technique for corrective posterior spinal surgery.
Methods: Five patients had surgical correction of Lenke type 1 or 2 AIS using the ST2R technique. The preoperative average Cobb angle was 72.4° ± 19.4. Low-dose standing biplanar radiographs were obtained to evaluate several spinal and pelvic parameters preoperatively (five patients), immediately postoperatively (four patients), and at follow-up (four patients). Three-dimensional reconstructions were performed (a total of 13 reconstructions).
Results: The mean number of levels fused was 11.2° ± 2.0. The number of pedicle screws used for constructs averaged 19.2° ± 3.06 (1.75 density screw per vertebra). The Cobb angle values were significantly changed by the operation (75° ± 21 to 28° ± 7, p = 0.009), but no other parameters were altered. The maximal apical axial change at the junctional region was 32.8° (absolute value), and the minimal apical axial change at the apical region was 4.8° (absolute value). The intervertebral rotation difference in the axial plane was larger near the apical region (T8-T9), from 2.1° ± 2.7 to -14° ± 6.9, and smaller near the junctional region (T12-L1), from -2.6° ± 2.9 to -1.1° ± 8.4.
Conclusion: This case series suggests that corrective posterior spinal surgery for AIS using ST2R can achieve both 3D correction of the spine and additional intervertebral axial rotation, with minimal deterioration during follow-up. Preoperative, postoperative, and follow-up evaluation can be accurately evaluated with EOS low-dose 3D imaging.