The calcaneofibular ligament is torn in a higher grade of lateral ankle sprain than the anterior talofibular ligament. Which of the following tests specifically assesses calcaneofibular ligament integrity?

• A Anterior drawer test of the ankle
• B Thompson's test
• C Single leg heel rise test
• D Talar tilt test (inversion stress test) ✓

Explanation

The talar tilt test (inversion stress test) specifically assesses the calcaneofibular ligament integrity by stressing the subtalar joint in inversion — excessive talar tilt indicates CFL rupture. The anterior drawer test assesses the anterior talofibular ligament (ATFL), the first ligament torn in lateral ankle sprains. Thompson's test assesses Achilles tendon rupture. Single leg heel rise assesses posterior tibialis tendon function.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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