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. 2022 Sep;12(7):1516-1523.
doi: 10.1177/21925682221098667. Epub 2022 Apr 29.

The Importance of Lumbar Curve Flexibility and Apical Vertebral Rotation for the Prediction of Spontaneous Lumbar Curve Correction in Selective Thoracic Fusion for Lenke Type 1 and 2 C Curves: Retrospective Cohort Study with a Mean Follow-Up of More than 10 years

Ozcan Kaya  1 , Deniz Kara  2 , Halil Gok  2 , Sinan Kahraman  3 , Tunay Sanlı  2 , Selhan Karadereler  2 , Meric Enercan  2   4 , Azmi Hamzaoglu  2
Affiliations

The Importance of Lumbar Curve Flexibility and Apical Vertebral Rotation for the Prediction of Spontaneous Lumbar Curve Correction in Selective Thoracic Fusion for Lenke Type 1 and 2 C Curves: Retrospective Cohort Study with a Mean Follow-Up of More than 10 years

Ozcan Kaya et al. Global Spine J. 2022 Sep.

Abstract

Study design: Retrospective analysis of a prospectively collected data.

Objective: Lumbar flexibility(LF) is generally defined with preoperative side bending films;it is not clear what percentage of LF predicts the spontaneous lumbar curve correction (SLCC) at long term follow up. Aim of this study was to find out cut-off value of preoperative LF,apical vertebra rotation(AVR) and apical vertebral translation(AVT);which may predict more than 50%SLCC.

Methods: Patients with Lenke 1C&2C curves,treated with posterior STF,with a minimum 10 years follow up were included.The patients who had more than 50% SLCC(Group A) or less than 50% (Group B) were compared in terms of LF,AVR and AVT to understand a cut-off value of those parameters.Statistically, Receiver Operating Characteristic(ROC) test was used.

Results: Fifty five AIS patients (54F, 1M) with mean age 14 (11-17) were included to study.Thoracic curve correction rate was 75%;lumbar curve correction rate was 59% at the latest follow up.Group A included 45(82%) patients at the latest follow up.Three patients (5%) showed coronal decompensation at early postop and 2 of them became compensated at f/up.ROC analyses showed 69% flexibility as the cut-off value for SLCC (P < .01).The difference between groups in terms of preop mean AVRs was significant (P = .029) (Group A = 1.9; Group B = 2.4).

Conclusion: In Lenke 1C&2C curves,whenever LF on the preoperative bending x-ray is greater than 70% (P < .01)and AVR is equal or less than grade 2,STF provides satisfactory clinical and radiological SLCC with more than mean 10 years f/up.This flexibility rate and apical vertebral rotation can be helpful in decision making for successful STF.

Keywords: adolescent idiopathic scoliosis; apical vertebra rotation; apical vertebra translation; lumbar curve flexibility; lumbar modifier c; posterior instrumentation; selective thoracic fusion; spontaneous lumbar curve correction.

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Conflict of interest statement

Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1.
Figure 1.
15 years female patient. A: Preop AP Standing X-ray; B: Bending X-rays; C: Early-postop AP Standing Xray; D: 11 years Follow-up AP and LAT Standing X-rays; AP: Anteroposterior; LAT: Lateral.
Figure 2.
Figure 2.
14 years female patient. A: Preop AP Standing X-ray; B: Bending X-rays; C: Early-postop AP Standing Xray; D: 19 years Follow-up AP and LAT Standing X-rays; AP: Anteroposterior; LAT: Lateral.
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