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Geometric and morphological changes of the intervertebral disc under fatigue testing
Chin-Yin Yu1, Kuen-Horng Tsai, Wen-Pin Hu
1Department of Radiology, Medical Center, National Cheng Kung University, No. 138 Sheng-Li Rd., Tainan, Taiwan.
Clinical Biomechanics (Bristol, Avon)
|June 28, 2003
Summary
Loading rate impacts intervertebral disc injury mechanisms. Magnetic resonance imaging revealed nucleus pulposus shape changes, ligament bulging, and annulus fibrosus dehydration, linking fatigue failure to degeneration.
Area of Science:
- Biomedical Engineering
- Orthopedics
- Spine Biomechanics
Background:
- Low back pain is frequently caused by intervertebral disc problems.
- Slow, repetitive loading is a critical factor in spine and disc injuries.
Purpose of the Study:
- To investigate intervertebral disc injury mechanisms under varying loading rates.
- To analyze anatomic and histological changes in intervertebral discs.
Main Methods:
- Fresh porcine lumbar spines (24 functional units) underwent cyclic loading at three distinct rates.
- Geometric measurements and magnetic resonance imaging (MRI) assessed morphological changes.
- Stereomicroscopy provided detailed observations.
Main Results:
- No significant geometric changes were observed across different loading rates.
- MRI revealed nucleus pulposus shape alterations, anterior/posterior longitudinal ligament bulging, and annulus fibrosus dehydration.
- High correspondence was found between MRI and anatomical observations of nucleus pulposus.
Conclusions:
- Morphological changes in intervertebral discs were identified in specific lesions.
- Fatigue failure, degeneration, and instability are strongly interconnected.
- Analysis aids in understanding early-stage disc degeneration triggers.