Advanced Sacroiliac Joint Quiz

Q1. Which concept describes stability produced by the shape and congruence of the sacroiliac joint surfaces?

• Open chain rotation
• Form closure
• Force closure
• Capsular distraction

Q2. What does force closure of the sacroiliac joint refer to?

• Separation of the sacrum from the ilium
• Complete fusion of the joint surfaces
• Stability created only by articular surface shape
• Dynamic compression produced by muscles, fascia, and ligaments

Q3. Why does nutation generally increase sacroiliac stability?

• It increases ligament tension and joint compression
• It removes all ligamentous tension
• It converts the joint into a ball and socket joint
• It separates the auricular surfaces widely

Q4. Which ligament is especially important in resisting separation between the sacrum and ilium?

• Inguinal ligament
• Inferior pubic ligament
• Ligament of the head of the femur
• Interosseous sacroiliac ligament

Q5. Why can pregnancy affect sacroiliac joint mobility?

• The sacroiliac joints disappear during pregnancy
• Hormonal changes can increase ligamentous laxity
• The ilia normally fuse completely to the sacrum
• The joints become unrestricted ball and socket joints

Q6. Why can sacroiliac joint pain be difficult to localize clinically?

• The joint is located outside the pelvis
• The joint has no sensory innervation
• Pain can arise only from the anterior abdominal wall
• Its pain patterns can overlap with those of nearby structures

Q7. Which nerve levels are commonly associated with posterior sacroiliac joint innervation?

• L5 and upper sacral posterior rami
• T1 to T3 only
• Femoral nerve only
• C1 to C3 only

Q8. How does the sacroiliac joint contribute to efficient locomotion?

• It prevents all transmission of ground reaction forces
• It isolates the lower limbs from the trunk
• It allows unrestricted rotation of the sacrum
• It transfers forces while permitting small adaptive movements

Q9. Why is significant sacroiliac disruption important in pelvic trauma?

• It cannot influence pelvic stability
• It may indicate disruption of the posterior pelvic ring
• It affects only the shoulder girdle
• It always represents an isolated minor injury

Q10. Which statement best integrates the anatomy and function of the sacroiliac joint?

• It is a freely mobile synovial joint designed primarily for circumduction
• It is a strongly stabilized articulation between the sacrum and ilium that transfers load while allowing limited movement
• It is an immovable suture unrelated to weight transfer
• It is a fibrocartilaginous joint connecting the two pubic bones