Abstract
Objective
To raise the diagnostic criteria, classification and treatment strategy of dynamic sagittal imbalance (DSI).
Methods
One hundred thirty-three adult spinal deformity (ASD) patients with stooping and back pain after walking were retrospectively analyzed. Based on the radiographic parameters and Oswestry Disability Index (ODI) scores, the diagnostic criteria of DSI were raised. DSI patients received nonoperative treatment and (or) surgery. Radiographic parameters and health-related quality of life (HRQOL) outcomes would be measured and compared between prewalk and postwalk and among each subgroup.
Results
One hundred thirty-three ASD patients with stooping and back pain after walking were enrolled in our study. The quantitative diagnostic criteria was prewalk SVA < 40 mm and postwalk SVA-prewalk SVA ≥ 20 mm after 10-min walk. Based on the quantitative diagnostic criteria of DSI raised by our team, DSI patients could be classified into three groups: 20 mm ≤ ΔSVA < 60 mm (mild, 31.0%), 60 mm ≤ ΔSVA < 100 mm (moderate, 42.1%) and ΔSVA ≥ 100 mm (severe, 27.0%). After nonoperative treatment, the ΔSVA in mild and moderate group was prominently decreased (P < 0.001) with the significant improvement of HRQOL outcomes (P < 0.001), while there was no significant change in ΔSVA and clinical outcomes in group C (P > 0.05). Patients who received the operative treatment showed prominent improvement in ΔSVA and clinical outcomes (P < 0.001).
Conclusion
Our study proposed a quantitative diagnostic criteria and novel classification of DSI. Nonoperative treatment is effective for most DSI patients with ΔSVA < 100 mm, while the majority of DSI patients with ΔSVA ≥ 100 mm need operative intervention.
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The research project was approved by the ethics department of Shanghai Changzheng Hospital, Shanghai. We have consensus with all participants. All the procedures were done under the Declaration of Helsinki and relevant policies in China. The Manuscript submitted does not contain information about medical device(s)/drug(s).
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Yin, J., Ma, X., Lin, T. et al. Characteristics and treatment of dynamic sagittal imbalance in adult spinal deformity. Eur Spine J 29, 2340–2353 (2020). https://doi.org/10.1007/s00586-020-06459-8
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DOI: https://doi.org/10.1007/s00586-020-06459-8