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How to Optimize Axial Correction Without Altering Thoracic Sagittal Alignment in Hybrid Constructs With Sublaminar Bands: Description of the “Frame” Technique

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Abstract

Study Design

Retrospective monocentric database study.

Objectives

To describe the “frame” reduction technique and report the 3D quantitative analysis of postoperative corrections in a consecutive series of thoracic adolescent idiopathic scoliosis (AIS) patients.

Summary of Background Data

Posteromedial translation technique using sublaminar bands have been proved to be efficient and safe for 3D correction of the deformity and overall cosmetic aspect of the trunk. However, the ability to correct the axial plane may tend to rotate the vertebra clockwise instead of counterclockwise, thus increasing apical vertebra axial rotation (AVR) and the rib hump. A technical improvement was developed to emphasize axial correction.

Methods

60 thoracic AIS patients consecutively operated by posteromedial translation using the “frame” reduction technique were included with a minimum 2-year follow-up. Precontoured rods were connected with fixed transverse connectors according to a personalized preoperative planning. Rods were first inserted distally in the pedicle screws to achieve lumbar correction, and then in the upper anchors, and finally sublaminar bands were connected to their corresponding rods to progressively bring the concave lamina to the concave rod to correct the thoracic deformity. Sagittal and coronal 3D measures were performed preoperatively and at the latest follow-up using SterEOS (EOS Imaging, Paris, France) to assess the efficiency of the technique.

Results

The distance from the center of the apical vertebra to the reference axis in the frontal plane was reduced from 4.7 to 1.1 cm, traducing the efficient medial translation of the spine during correction. T1–T12 kyphosis significantly increased after surgery (28°–35°). 3D location of the upper instrumented vertebra (UIV) was not affected. The apical rotation was significantly reduced after surgery (19°–11°), and the AVR correction rate averaged 42.2%.

Conclusion

The “frame” technique is an innovative way of using polyester bands, optimizing axial correction while respecting sagittal alignment.

Level of Evidence

Level IV.

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Authors and Affiliations

  1. Department of Pediatric Orthopaedics, Robert Debré Hospital, AP-HP, Paris Diderot University, 48 Bd Sérurier, Paris, 75019, France

    Brice Ilharreborde MD, PhD, Anne Laure Simon MD, Emmanuelle Ferrero MD & Keyvan Mazda MD

Authors
  1. Brice Ilharreborde MD, PhD
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  2. Anne Laure Simon MD
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  3. Emmanuelle Ferrero MD
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  4. Keyvan Mazda MD
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Corresponding author

Correspondence to Brice Ilharreborde MD, PhD.

Additional information

Author disclosures: BI (other from Implanet, ZimmerBiomet, and from Medtronics, outside the submitted work), ALS (none), EF (none), KM (other from Implanet, outside the submitted work).

Ethical approval: Retrospective study approved by the local ethics committee.

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Ilharreborde, B., Simon, A.L., Ferrero, E. et al. How to Optimize Axial Correction Without Altering Thoracic Sagittal Alignment in Hybrid Constructs With Sublaminar Bands: Description of the “Frame” Technique. Spine Deform 7, 245–253 (2019). https://doi.org/10.1016/j.jspd.2018.08.013

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  • DOI: https://doi.org/10.1016/j.jspd.2018.08.013

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