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Characteristics of Sciatic Scoliotic List in Lumbar Disc Herniation
Yao Zhao1, Longtao Qi1, Chenyuan Ding2
1Department of Orthopaedics, Peking University First Hospital, Beijing, China.
Global Spine Journal
|September 16, 2022
Summary
Sciatic scoliotic list (SSL) in lumbar disc herniation (LDH) patients presents unique coronal and sagittal parameters. A new classification system was established, with 95.8% of patients fitting Type 1.
Area of Science:
- Orthopedics
- Radiology
- Spine Surgery
Background:
- Sciatic scoliotic list (SSL) is observed in some patients with lumbar disc herniation (LDH).
- Understanding the characteristics of SSL curves is crucial for diagnosis and treatment.
- A standardized classification for SSL is needed.
Purpose of the Study:
- To evaluate the coronal and sagittal parameters of the sciatic scoliotic list (SSL) curve in patients with lumbar disc herniation (LDH).
- To describe the specific characteristics of SSL curves.
- To establish a new classification system for SSL.
Main Methods:
- Retrospective radiological study of 230 patients with single-segment LDH (96 SSL group, 134 non-SSL group).
- Comparison of radiographic parameters between SSL and non-SSL groups, and with 70 healthy controls.
- Analysis of Cobb's angle, trunk shift, apical vertebral translation, and sagittal parameters.
Main Results:
- SSL group showed specific Cobb's angle (12.5 ± 5.3°), trunk shift (26.2 ± 17.9 mm), and apical vertebral translation (31.7 ± 16.0 mm).
- Lumbar lordosis and thoracic kyphosis decreased, pelvic tilt increased, and sagittal vertical axis moved forward in the SSL group.
- Two main SSL patterns were identified, with 95.8% of patients classified as Type 1 based on vertebral shift relative to the central sacral vertical line (CSVL).
Conclusions:
- The SSL curve is characterized by a long thoracic or thoracolumbar curve with a straight sagittal profile and minimal rotation.
- Vertebral shifts in SSL are ipsilateral to the central sacral vertical line (CSVL).
- These distinct features differentiate SSL curves from other structural scoliosis types.
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