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9 Cards in this Set
- Front
- Back
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What two changes occur in the vascular supply to the disk with aging?
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Vessels begin disappearing after the age of 1- years
Endplates ossify |
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What is the source of nutrients to the disk?
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Diffusion through endplates
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What two external factors decrease endplate permeability?
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Smoking
Vibration |
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What factors increase permeability?
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Exercise
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How does aging affect the disk's collagen content?
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Decreased collagen content
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How does aging affect the disk's fibril diameter?
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Increased fibril diameter and variability
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How does aging affect the disk's noncollagenous protein?
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Increased noncollagenous protein
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How does aging affect the disk's pH?
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Decreased pH
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Magnetic resonance imaging (MRI): what are the rates of false-positive (asymptomatic) findings for patients <40 yrs old, >40 yrs old, and >60 yrs old?
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<40 yrs old: 25%
>40 yrs old: 60% >60 yrs old: 90% |
