23 Questions
What is the origin of the long posterior sacroiliac ligament?
3rd and 4th sacral segments
Which ligament limits anterior pelvic rotation or sacral counternutation?
Long posterior sacroiliac ligament
What is the distal attachment of the sacrotuberous ligament?
Ischial tuberosity
What is the function of the sacrospinous and sacrotuberous ligaments?
All of the above
What is the origin of the sacrospinous ligament?
Lateral margin of the caudal end of the sacrum and coccyx
What is the function of the iliolumbar ligament?
Stabilizing L4-L5 on the ilium
What is a characteristic of the sacroiliac joint in childhood?
Surrounded by a pliable capsule and mobile
What happens to the joint capsule with aging?
It becomes increasingly fibrosed and less mobile
What is the function of the short posterior sacroiliac ligament?
Limiting all pelvic and sacral movement
What are the two terms used to describe movements at the sacroiliac joint?
Nutation and counternutation
What is nutation?
Anterior tilt of the base of the sacrum
What is counternutation?
Posterior tilt of the base of the sacrum
What occurs in both genders, earlier in men and following menopause in women?
Fibrous adhesions
What happens to the hyaline cartilage by the eighth decade?
It thins and deteriorates
What is the result of nutation at the sacroiliac joint?
Decreasing the size of the pelvic inlet
What happens to the sacrum when it is free to move under the force of gravity?
It rotates anteriorly relative to the ilium
What is the effect of hip flexion on the sacroiliac joint in the supine position?
It generates nutation
What is the result of counternutation at the sacroiliac joint?
Increasing the size of the pelvic inlet
What is the effect of the femoral heads on the ilium?
They produce an upward-directed compression force
What is the name of the position where the sacroiliac joint is locked?
Close-packed position
In the supine position, what generates counternutation at the sacroiliac joint?
Hip extension
What is the role of gravity in the movement of the sacrum?
It causes the sacrum to rotate anteriorly
What is the result of the combination of the downward force of gravity and the upward-directed compression force of the femoral heads?
A nutation torque
Test your knowledge of the sacroiliac ligaments, including their origins, insertions, and relationships with other anatomical structures. Learn about the posterior SI ligaments, sacrotuberous ligament, and sacrospinous ligament. Improve your understanding of human anatomy with this quiz.
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