Biomechanics of Lumbar Spine - Dr. Faiqa Yawer
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Questions and Answers

What is the main functional purpose of the lumbar vertebrae in the human body?

  • Supporting the weight of the arms and head
  • Resisting rotational torsion and shear
  • Supporting the weight of the trunk positioned above it (correct)
  • Reducing stress on the thoracic vertebrae
  • Which part of the spine sustains approximately 30% of the compressive loads when the spine is in hyperextension?

  • Facet joints (correct)
  • Annulus fibrosus
  • Intervertebral discs
  • Vertebral bodies
  • Where are contact forces largest within the spine according to the text?

  • Lumbar vertebrae
  • Intervertebral discs
  • Facet joints at L5-S1 (correct)
  • Vertebral bodies
  • What provides about 80% of the spine's ability to resist rotational torsion and shear?

    <p>Facet joints</p> Signup and view all the answers

    What structures are symphysis joints with fibrocartilaginous discs acting as cushions?

    <p>Intervertebral discs</p> Signup and view all the answers

    What accounts for approximately one-fourth of the height of an adult's spine?

    <p>Intervertebral discs</p> Signup and view all the answers

    What is the primary function of the ligamentum flavum in the spine?

    <p>To enhance spinal stability</p> Signup and view all the answers

    Which type of fibers are predominantly found in the ligamentum flavum, making it unique from other spinal ligaments?

    <p>Elastic fibers</p> Signup and view all the answers

    What is the term used to describe the slight, constant compression in the intervertebral discs due to the tension in the ligamentum flavum?

    <p>Prestress</p> Signup and view all the answers

    Which spinal curves are present at birth and are referred to as primary curves?

    <p>Thoracic and sacral curves</p> Signup and view all the answers

    What is the term used to describe the process by which bones are shaped in response to forces acting on them?

    <p>Modeling</p> Signup and view all the answers

    During which growth period does the curvature of the lumbar spine increase approximately 10%?

    <p>Between the ages of 7 and 17</p> Signup and view all the answers

    What is the term for the functional unit of the spine consisting of two adjacent vertebrae and the soft tissues between them?

    <p>Motion segment</p> Signup and view all the answers

    Which type of joint are the right and left facet joints between the superior and inferior articular processes of adjacent vertebrae?

    <p>Diarthrosis of gliding type</p> Signup and view all the answers

    What serves as the primary weight-bearing component of the spine?

    <p>Vertebral bodies</p> Signup and view all the answers

    What is the structure formed by the neural arches, posterior side of the bodies, and intervertebral discs for protecting the spinal cord?

    <p>Vertebral canal</p> Signup and view all the answers

    Which region of the spine exhibits a progressive increase in vertebral size from the cervical to lumbar region?

    <p>Lumbar region</p> Signup and view all the answers

    What is the purpose of the first two cervical vertebrae known as atlas?

    <p>Provide a receptacle for condyles of the occiput</p> Signup and view all the answers

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