Which of the following statements best fits the description of the sacroiliac ligaments?
a. The sacroiliac ligaments are reinforced by fibrous expansions from the erector spinae and gluteus maximus.
b. The fascial support is greater anteriorly than posteriorly.
c. The sacrotuberous and sacrospinous ligaments are not part of the sacroiliac ligaments.
d. The short posterior sacroiliac ligament is considered by some just a capsular reinforcement.
ANS: A
The sacroiliac ligaments include all of the named sacroiliac ligaments and the sacrotuberous and
sacrospinous ligaments. The system is well reinforced posteriorly by fascia and by several fibrous
expansions from posterior muscles (including the gluteus maximus and erector spinae). The
anterior sacroiliac ligament is considered by some to be a capsular ligament, and the interosseous
sacroiliac ligament (including its short posterior portion) is considered the most important ligament
of the complex.
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