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IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4. Other Fatigue Effects. Other Fatigue Effects. Joints. Types of joints: Synovial – articulating surfaces, surrounded by capsule (shoulder, knee)

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IE 553

Engineering of Human Work

Dr. Andris Freivalds

Class #4

IE 553


IE 553

Engineering of Human Work

Dr. Andris Freivalds

Class #4

IE 553




Joints
Joints

Types of joints:

  • Synovial – articulating surfaces, surrounded by capsule (shoulder, knee)

  • Fibrous – fibers bridge gap (skull)

  • Cartilage – cartilage bridges gap (vertebral discs in spinal column)

IE 553


Synovial joint
Synovial Joint

  • Cartilage (cells 2%)

    • Collagen fibers (60%)

    • Proteoglycan gel (38%)

    • Poor regeneration

  • Liquid (synovial fluid)

    • Decreases friction

    • Through lubrication

      • Hydrostatic

      • Squeeze film

      • Hydrodynamic

IE 553



Intervertebral discs
Intervertebral Discs

  • Role in body

    • Cushion impacts

    • Deform under loads

    • Transfer of fluids

  • Degeneration

    • Microfractures at high loads

    • Loss of fluids/solids

    • Drying up

    • Weakening of fibers

    • Catastrophic extrusion

IE 553


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