Sacrolumbar Nutation and Counternutation N374
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Questions and Answers

What are nutation and counternutation?

  • Terms used to describe movements in the frontal plane
  • Terms used to describe movements in the transverse plane
  • Terms used to describe movements limited to the near sagittal plane (correct)
  • Terms used to describe movements in the coronal plane

    • Which motion is considered nutation?

  • The posterior tilt of the base of the sacrum relative to the ilium
  • The anterior tilt of the base of the sacrum relative to the ilium (correct)
  • The anterior tilt of the ilium relative to the sacrum
  • The posterior tilt of the ilium relative to the sacrum

    • Which motion is considered counternutation?

  • The posterior tilt of the base of the sacrum relative to the ilium (correct)
  • The anterior tilt of the base of the sacrum relative to the ilium
  • The anterior tilt of the ilium relative to the sacrum
  • The posterior tilt of the ilium relative to the sacrum

    • What creates the primary stabilizing forces at the sacroiliac joint?

    <p>All of the above</p> Signup and view all the answers

    What is the close-packed position of the sacroiliac joint?

    <p>Full nutation</p> Signup and view all the answers

    Which forces increase articular stability at the sacroiliac joint?

    <p>Both compression and shear forces</p> Signup and view all the answers

    Which of the following is a vulnerable position for the sacroiliac joint?

    <p>Full nutation</p> Signup and view all the answers

    Which of the following motions can cause nutation and counternutation?

    <p>Both sacral-on-iliac and iliac-on-sacral rotation</p> Signup and view all the answers

    What is the natural position of the sacroiliac joint when unloaded?

    <p>Full counternutation</p> Signup and view all the answers

    Which of the following is not a primary stabilizing force at the sacroiliac joint?

    <p>None of the above</p> Signup and view all the answers

    Which plane are the articular surfaces of the sacroiliac joint largely in?

    <p>Sagittal plane</p> Signup and view all the answers

    Which motion increases compression and shear forces between joint surfaces?

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

    Study Notes

    • The sacroiliac joint has complex rotational and translational movements.
    • Nutation and counternutation are terms used to describe movements limited to the near sagittal plane.
    • Nutation is the anterior tilt of the base of the sacrum relative to the ilium, while counternutation is the reverse motion.
    • Nutation and counternutation can occur by sacral-on-iliac rotation, iliac-on-sacral rotation, or both motions performed simultaneously.
    • Nutation increases compression and shear forces between joint surfaces, thereby increasing articular stability.
    • The close-packed position of the sacroiliac joint is considered full nutation.
    • Forces that create a nutation torque are considered the primary stabilizing forces at the sacroiliac joint.
    • The stabilizing torque is created by gravity, stretched ligaments, and muscle activation.
    • When unloaded, the sacroiliac joints naturally return to a less stable, or counternutated, position.
    • The plane of the articular surfaces of the sacroiliac joint is largely vertical, making it vulnerable to vertical slipping, especially when subjected to large forces.

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