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16 Cards in this Set
- Front
- Back
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What structures are composed of Type I collagen?
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-structures exposed to tension
-skin -tendon -capsule -muscle -annulus fibrosis -mensici and bone |
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What structures are composed of Type II collagen?
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-those exposed to compression
-articular cartilage -nucleus pulposus |
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What are 2 characteristics of collagen based structures?
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-tensile strength
-extensibility |
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What contributes to extensibility of collagen based structures?
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-strain of collagen fibers
-uncrimping of collagen -glide between fibers/fibrils -water content redistribution |
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Compare and contrast cortical and trabecular bone.
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CORTICAL - very high strength and stiffness, anisotropic, stiffness and ultimate load increase with increase of load speed
TRABECULAR - mod to low strength and stiffness, anisotropic, stiffness and ultimate load increase with load speed |
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What structures are composed of dense regular connective tissue?
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-tendons
-ligaments |
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What structures are composed of dense irregular connective tissue?
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-capsule
-fascia |
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What are the mechanical properties of connective tissue?
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-anisotropic
-ultimate load and strain increase with load speed -stiffness does not increase with load speed -exhibit viscoelasticity |
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What is the effect of aging on connective tissue?
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-general loss of collagen after maturation
-increase in crosslinks resulting in greater tensile strength |
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What effect do NSAIDs have on connective tissue?
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-increase in collagen and proportion of insoluble collagen which increases tensile strength
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What factors contribute to fatigue failure of connective tissue?
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-exposure to loads that are too large, too numerous, or too frequent
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What are the mechanical properties of cartilage?
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-anisotropic
-biphasic -large viscoelastic deformation |
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What contributes to the biphasic nature of cartilage?
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-water allows fluid phase
-collagen and proteoglycan provides solid phase |
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What properties of connective tissue allow viscoelastic deformation?
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-fluid exudation
-fluid redistribution |
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What are the 2 types of lubrication of joint surfaces?
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-boundary
-fluid film => both provide separation of joint surfaces |
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What are the 5 determinants of muscle force production?
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-architecture
-fiber type -length -speed of contraction -motor unit recruitment |
