Abstract
Purpose
The use of vertebral body tethering (VBT) for the treatment of main thoracic deformities in adolescent idiopathic scoliosis patients is becoming increasingly more common, but limited data exist on its safety and efficacy in thoracolumbar deformities. We aimed to evaluate the postoperative outcomes of patients with thoracolumbar (TL) deformities that were treated with VBT.
Methods
We assessed clinical and radiographic data from twenty-eight consecutive patients that were surgically managed with VBT, all of whom exhibited a TL deformity with at least two years (mean: 44.7 ± 14.5 months) of postoperative follow-up. Standard radiographic parameters were extracted from left hand wrist and standing posterior–anterior and lateral spine radiographs at various timepoints. Outcome variables were assessed based on preoperative Lenke Classification and included: deformity measures, complications, surgical revisions, and postoperative success.
Results
The mean age at the time of instrumentation was 13.4 ± 1.3 years, with an average preoperative Sanders Stage of 4.6 ± 1.4. A significant reduction in preoperative deformities was observed at most postoperative timepoints. A perioperative complication was observed in three patients and surgical revision was required in another four patients. A suspected broken tether was observed in sixteen patients, most of which occurred at the apex of the lumbar deformity. Only one patient required surgical revision due to a suspected broken tether. We observed an overall success rate of 57%, regardless of Lenke Classification.
Conclusions
These data indicate that VBT can successfully correct TL deformity patterns in 57% of patients without an increase in the rate of perioperative complications, suspected broken tethers, or surgical revisions.
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Acknowledgements
This work was supported by an Investigator Initiated Research Grant from Zimmer Biomet to Daniel G. Hoernschemeyer and Melanie E. Boeyer.
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This work was funded by Zimmer Biomet (Grant no. IRU2019-43S).
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MEB: conception, design, data analysis, data interpretation, drafted manuscript, revised manuscript, approved final version, and agreed to be accountable. DGH: conception, design, data acquisition, data interpretation, drafted manuscript, revised manuscript, approved final version, and agreed to be accountable. SF: data analysis, data interpretation, drafted manuscript, revised manuscript, approved final version, and agreed to be accountable. SW: design, data interpretation, drafted manuscript, revised manuscript, approved final version, and agreed to be accountable.
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Melanie E. Boeyer: ZimVie—Research Support. Daniel G. Hoernschemeyer: ZimVie—Research Support, Consultant Orthopaediatrics—IP Royalties, Paid Consultant, Stock or Stock Options Biomarin—Paid Presenter or Speaker, Research Support. Sophi Farid: None. Sebastian Wiesemann: None.
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Boeyer, M.E., Farid, S., Wiesemann, S. et al. Outcomes of vertebral body tethering in the lumbar spine. Spine Deform 11, 909–918 (2023). https://doi.org/10.1007/s43390-023-00662-5
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DOI: https://doi.org/10.1007/s43390-023-00662-5