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Effect of disc lesion on microdamage accumulation in lumbar vertebrae under cyclic compression loading
K Hasegawa1, C H Turner, J Chen
1Biomechanics and Biomaterials Research Center, Indiana University, Indianapolis, USA.
Clinical Orthopaedics and Related Research
|February 1, 1995
Summary
Disc lesions significantly increase vertebral microdamage during fatigue loading. This suggests disc degeneration contributes to vertebral fragility, particularly in those with lower bone mass.
Area of Science:
- Orthopedics
- Biomechanics
- Spinal Research
Background:
- Intervertebral disc degeneration is a common condition.
- Vertebral microdamage can lead to fractures and instability.
- The relationship between disc health and vertebral integrity under load requires further investigation.
Purpose of the Study:
- To investigate the impact of disc lesions on microdamage accumulation in adjacent vertebrae during fatigue loading.
- To determine if disc degeneration contributes to vertebral fragility.
Main Methods:
- A canine model was used, with functional spinal units divided into control, normal disc loading, and disc lesion groups.
- Physiologic cyclic compression was applied for 10^5 cycles.
- Fractional trabecular bone area and microcrack density in vertebrae were quantified.
Main Results:
- Significantly higher microcrack density was observed in functional spinal units with disc lesions compared to controls.
- Microcracks were predominantly located in the vertebral region adjacent to the nucleotomized disc.
- A negative association was found between microcrack density and fractional trabecular bone area.
Conclusions:
- Disc degeneration significantly contributes to microdamage accumulation in adjacent vertebrae.
- Vertebral fragility is exacerbated by disc lesions, especially in vertebrae with reduced bone mass.
- These findings highlight the biomechanical link between disc health and spinal structural integrity.