Sacroiliac Ligaments Anatomy
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Questions and Answers

What is the origin of the long posterior sacroiliac ligament?

  • Iliac tuberosity
  • 3rd and 4th sacral segments (correct)
  • Posterior-lateral side of the sacrum
  • Ischial tuberosity

    • Which ligament limits anterior pelvic rotation or sacral counternutation?

  • Short posterior sacroiliac ligament
  • Sacrotuberous ligament
  • Sacrospinous ligament
  • Long posterior sacroiliac ligament (correct)

    • What is the distal attachment of the sacrotuberous ligament?

  • Lateral sacrum
  • Ischial spine
  • Ischial tuberosity (correct)
  • Iliac tuberosity

    • What is the function of the sacrospinous and sacrotuberous ligaments?

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

    What is the origin of the sacrospinous ligament?

    <p>Lateral margin of the caudal end of the sacrum and coccyx</p> Signup and view all the answers

    What is the function of the iliolumbar ligament?

    <p>Stabilizing L4-L5 on the ilium</p> Signup and view all the answers

    What is a characteristic of the sacroiliac joint in childhood?

    <p>Surrounded by a pliable capsule and mobile</p> Signup and view all the answers

    What happens to the joint capsule with aging?

    <p>It becomes increasingly fibrosed and less mobile</p> Signup and view all the answers

    What is the function of the short posterior sacroiliac ligament?

    <p>Limiting all pelvic and sacral movement</p> Signup and view all the answers

    What are the two terms used to describe movements at the sacroiliac joint?

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

    What is nutation?

    <p>Anterior tilt of the base of the sacrum</p> Signup and view all the answers

    What is counternutation?

    <p>Posterior tilt of the base of the sacrum</p> Signup and view all the answers

    What occurs in both genders, earlier in men and following menopause in women?

    <p>Fibrous adhesions</p> Signup and view all the answers

    What happens to the hyaline cartilage by the eighth decade?

    <p>It thins and deteriorates</p> Signup and view all the answers

    What is the result of nutation at the sacroiliac joint?

    <p>Decreasing the size of the pelvic inlet</p> Signup and view all the answers

    What happens to the sacrum when it is free to move under the force of gravity?

    <p>It rotates anteriorly relative to the ilium</p> Signup and view all the answers

    What is the effect of hip flexion on the sacroiliac joint in the supine position?

    <p>It generates nutation</p> Signup and view all the answers

    What is the result of counternutation at the sacroiliac joint?

    <p>Increasing the size of the pelvic inlet</p> Signup and view all the answers

    What is the effect of the femoral heads on the ilium?

    <p>They produce an upward-directed compression force</p> Signup and view all the answers

    What is the name of the position where the sacroiliac joint is locked?

    <p>Close-packed position</p> Signup and view all the answers

    In the supine position, what generates counternutation at the sacroiliac joint?

    <p>Hip extension</p> Signup and view all the answers

    What is the role of gravity in the movement of the sacrum?

    <p>It causes the sacrum to rotate anteriorly</p> Signup and view all the answers

    What is the result of the combination of the downward force of gravity and the upward-directed compression force of the femoral heads?

    <p>A nutation torque</p> Signup and view all the answers

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