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 (D)</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 (B)</p> Signup and view all the answers

What is the function of the iliolumbar ligament?

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

What happens to the joint capsule with aging?

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

What is the function of the short posterior sacroiliac ligament?

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

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

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

What is nutation?

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

What is counternutation?

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

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

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

What happens to the hyaline cartilage by the eighth decade?

<p>It thins and deteriorates (B)</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 (B)</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 (C)</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 (A)</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 (C)</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 (D)</p> Signup and view all the answers

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

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

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

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

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