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Updated: Jun 27, 2026
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Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
Published on: July 25, 2025
[Analysis of lumbar disc degeneration using three-dimensional nonlinear finite element method]
Xiao-Jun Tang1, Qi-Xin Chen, Yao-Sheng Liu
1Department of Orthopedic Surgery, Second Hospital of Medical College of Zhejiang University, Hangzhou 310009, China.
Zhonghua Yi Xue Za Zhi
|November 28, 2008
Summary
Early intervertebral disc degeneration causes lumbar spine instability. However, further degeneration restores stability, alters stress distribution, and impacts posterior structures.
Area of Science:
- Biomechanics
- Spinal Imaging
- Finite Element Analysis
Background:
- Intervertebral disc degeneration is a common cause of low back pain.
- Understanding its biomechanical consequences is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the biomechanical effects of intervertebral disc degeneration on the lumbar motion segment.
- To analyze changes in stiffness, stress, and load distribution.
Main Methods:
- A 3D nonlinear finite element model of the L4-L5 lumbar segment was created using CT images.
- Models simulated normal and progressively degenerated discs by altering material properties and disc height.
- Biomechanical properties were assessed under various loading conditions (flexion, extension, compression, shear).
Main Results:
- Lumbar spine stiffness initially decreased with light degeneration but increased with moderate to severe degeneration.
- Posterior structure force increased with light degeneration but decreased with further degeneration.
- Annular stress and nucleus pressure changed with degeneration, with stress concentrating peripherally.
Conclusions:
- Light intervertebral disc degeneration leads to lumbar spine instability, which paradoxically improves with further degeneration.
- Posterior structure force shows a negative correlation with intervertebral disc load.
- Disc degeneration alters load patterns, leading to peripheral stress concentration in the disc, vertebral body, and end-plate.
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