Intermediate Lumbosacral Joint Quiz

Q1. Which paired articulations supplement the intervertebral disc at the lumbosacral joint?

• Sacroiliac joints only
• L5 to S1 zygapophysial joints
• Hip joints
• Costotransverse joints

Q2. Why is the iliolumbar ligament important at the lumbosacral junction?

• It closes the greater sciatic foramen
• It joins the pubic bodies
• It attaches the femoral head to the acetabulum
• It helps stabilize L5 relative to the pelvis

Q3. Which mechanical force is especially important at the inclined L5 to S1 junction?

• Lateral compression of the ribs
• Posterior traction of the coccyx
• Anterior shear
• Only vertical distraction

Q4. What helps resist anterior displacement of L5 on S1?

• Facet joints and supporting ligaments
• The patellar ligament
• The interosseous membrane of the forearm
• The acetabular labrum alone

Q5. Which ligament is a major regional stabilizer extending from L5 toward the iliac crest?

• Coracoacromial ligament
• Transverse humeral ligament
• Iliolumbar ligament
• Annular ligament of the radius

Q6. What is the relationship of the lumbosacral joint to the sacral promontory?

• The promontory lies on the coccyx
• The promontory is formed by L1
• The superior anterior margin of S1 contributes to the promontory near the junction
• The promontory is part of the femur

Q7. Which movements can occur at the lumbosacral junction?

• Only pronation and supination
• Only circumduction
• Flexion, extension, lateral flexion, and limited rotation
• No movement at all

Q8. Which structure bears compressive load between L5 and S1 vertebral bodies?

• Sacrotuberous ligament
• Obturator membrane
• Intervertebral disc
• Acetabular labrum

Q9. How does the lumbosacral joint contribute to pelvic biomechanics?

• It controls movement of the jaw
• It connects the ribs to the sternum
• It transfers forces between the trunk and the sacrum
• It transfers forces from the hand to the forearm

Q10. Which description best characterizes the lumbosacral articulation?

• A primary cartilaginous joint only
• A fibrous syndesmosis only
• An intervertebral symphysis combined with paired synovial facet joints
• A single ball and socket joint