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Correlation between lordosis distribution index, lordosis tilt, and occurrence of proximal junctional kyphosis following surgery for adult degenerative scoliosis

A Correction to this article was published on 18 June 2022

This article has been updated

Abstract

Purpose

This study aimed to evaluate the effect of postoperative reciprocal progression of Lordosis tilt (LT), Lordosis distribution index (LDI) and occurrence of Proximal junctional kyphosis (PJK) following surgery for Degenerative lumbar scoliosis (DLS).

Methods

A total of 122 consecutive patients with ADS were treated with correction of deformity and followed up for a minimum of 2 years. Spinopelvic parameters were measured preoperatively, postoperatively, and at the latest follow-up. The Japanese Orthopaedic Association score, Oswestry Disability Index, and visual analog scale scores were measured at the latest follow-up. Associations between LT, LDI, and PJK were analyzed using receiver operating characteristic analyses.

Results

The prevalence of PJK in the present study was 24.6%. The outcomes of patients with PJK were significantly worse than those of patients without PJK. Postoperative reciprocal progression in LT and LDI with lumbar lordosis restorative surgery was observed. Preoperative risk factors for PJK were older age, larger LT, and larger Cobb angle of the curves. Postoperative risk factors for PJK included postoperative LT and postoperative Cobb angle of the curves, which were smaller than those preoperatively. We found a strong correlation between postoperative LT and Cobb angle of the curves resulting in PJK. Patients with LT < − 8° were at a higher risk of PJK.

Conclusions

LT can be used to predict the occurrence of PJK in patients undergoing surgery for DLS. Appropriate postoperative LT is crucial for preventing the progression of PJK.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Change history

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Funding

This article is supported by the National Natural Science Foundation of China (Grant No. 8187090666).

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Correspondence to Weishi Li.

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There is no conflict of interest.

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This study was approved by the institutional review board of the hospital. For this type of study formal consent is not required.

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Xu, F., Sun, Z., Li, W. et al. Correlation between lordosis distribution index, lordosis tilt, and occurrence of proximal junctional kyphosis following surgery for adult degenerative scoliosis. Eur Spine J 31, 267–274 (2022). https://doi.org/10.1007/s00586-021-07090-x

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Keywords

  • Adult degenerative scoliosis
  • Cobb angle of the curves
  • Lordosis distribution index
  • Lordosis tilt
  • Proximal junctional kyphosis