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Kappa: Preliminary Results on a Novel Technique for Pelvic Fixation in Adult Spinal Deformity Correction

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Abstract

Study Design

Retrospective cohort study.

Objectives

Pelvic fixation in degenerative spinal deformation is as crucial as demanding. Several pelvic anchoring technics have been described, but loosening rates remain high for most solutions. Here is described the “Kappa” technic, combining ilio-sacral screws to S2A1 screws at 2 years of follow-up.

Methods

Thirteen patients that underwent a spinal deformity correction with “Kappa” fixation to the pelvis and with more than 2 years of follow-up were prospectively included in this study. The surgical technic is described, and clinical and radiographic data have been collected for all patients.

Results

The population exhibited an important pre-operative sagittal imbalance (mean SVA of 104,4 mm, mean PI-LL mismatch of 22,8°) that had improved significatively after surgery (mean SVA of 75,5 mm and mean PI-LL mismatch of 4,9°). No loosening of pull-out of the implants was to deplore at 2 years of follow-up.

Conclusions

The association of ilio-sacral screw, resistant to pull-out because of the traction axis perpendicular to the construct, to S2A1 screws, known to be effective in sagittal balance restoration seems to be an effective and safe option to pelvic fixation for adult spinal deformity correction.

Level of Evidence

IV.

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Data Availability

The data are available from the corresponding author at reasonable request.

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Funding

No funding was received for this study.

Author information

Authors and Affiliations

  1. Department of Orthopaedic and Trauma Surgery, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France

    L. Marie-Hardy, R. Pietton, Y. Mohsinaly, R. Bonaccorsi & H. Pascal-Moussellard

  2. Department of Orthopaedic and Trauma Surgery, Dr. Exequiel Gonzales Cortez Hospital, Santiago, Chile

    D. Alvarez

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  1. L. Marie-Hardy
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  2. D. Alvarez
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  3. R. Pietton
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  4. Y. Mohsinaly
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  6. H. Pascal-Moussellard
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Contributions

All authors approved the version to be published and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. LMH and DH acquired and analyzed data, RP and YM interpreted data, RB and HPM concepted the work. LMH, DH, RP and YM drafted the work and RB and HPM revised it critically.

Corresponding author

Correspondence to L. Marie-Hardy.

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None of the authors has any conflict of interest to disclose relative to this work.

Research Ethics

This study was conducted according to the World Medical Association Declaration of Helsinki.

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Marie-Hardy, L., Alvarez, D., Pietton, R. et al. Kappa: Preliminary Results on a Novel Technique for Pelvic Fixation in Adult Spinal Deformity Correction. JOIO 57, 1826–1832 (2023). https://doi.org/10.1007/s43465-023-00959-7

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  • DOI: https://doi.org/10.1007/s43465-023-00959-7

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