Intermediate Tibiofibular Syndesmosis Quiz

Q1. Which structures form the principal ligamentous complex of the distal tibiofibular syndesmosis?

• Anterior and posterior talofibular ligaments only
• Deltoid and calcaneofibular ligaments only
• Spring and long plantar ligaments
• Anterior and posterior inferior tibiofibular ligaments with interosseous and transverse components

Q2. What is the interosseous ligament of the distal tibiofibular syndesmosis?

• A tendon from fibularis longus
• A distal thickening of the interosseous membrane
• A synovial fold from the subtalar joint
• A branch of the deltoid ligament

Q3. Which part of the talar trochlea helps explain physiological widening of the ankle mortise during dorsiflexion?

• The narrower posterior portion
• The medial tubercle of the posterior process
• The talar head only
• The wider anterior portion

Q4. Why is slight fibular motion necessary during ankle dorsiflexion?

• To disengage the talus from the tibia
• To accommodate the wider anterior talar trochlea
• To tighten the plantar fascia directly
• To flex the toes

Q5. Which syndesmotic ligament is most anterior and is commonly injured early in external rotation injuries?

• Anterior inferior tibiofibular ligament
• Posterior talofibular ligament
• Calcaneofibular ligament
• Tibionavicular ligament

Q6. What is the relationship of the posterior inferior tibiofibular ligament to the transverse tibiofibular ligament?

• The transverse ligament is a tendon of tibialis posterior
• They are unrelated structures on opposite sides of the foot
• The transverse ligament is part of the plantar fascia
• The transverse ligament forms a deep distal part of the posterior syndesmotic complex

Q7. What movement mechanism commonly stresses the syndesmosis?

• Knee extension without ankle load
• Isolated toe flexion
• Great toe adduction
• External rotation combined with ankle loading or dorsiflexion

Q8. Why can syndesmotic injury destabilize the ankle even when the talus itself is intact?

• It can alter the shape and congruity of the ankle mortise
• It removes the plantar fascia
• It fuses the subtalar joint
• It shortens the Achilles tendon

Q9. Which distal tibial surface articulates with the fibula at the syndesmosis?

• Medial malleolar articular surface
• Tibial tuberosity
• Anterior intercondylar area
• Fibular notch

Q10. Why is the interosseous membrane relevant to syndesmotic injury patterns?

• It attaches the talus to the calcaneus
• It isolates the ankle from all leg forces
• It prevents any fibular motion
• It can transmit injury forces proximally between the tibia and fibula