The interosseous talocalcaneal ligament stabilizes which joint?

• A. Subtalar joint
• B. Talo-navicular joint
• C. Calcaneocuboid joint
• D. Tibiotalar joint

Answer: (A)

The interosseous talocalcaneal ligament binds the talus to the calcaneus within the tarsal sinus, providing stability to the subtalar joint. By spanning the interosseous space between these two bones, it helps hold the talus and calcaneus together during weight bearing and hindfoot movement, particularly controlling inversion and eversion at the subtalar joint. Without this ligament, the subtalar joints would be more prone to excessive separation and abnormal motion.

The other joints listed are different articulations: the talonavicular joint is between the talus and navicular, the calcaneocuboid joint is between the calcaneus and cuboid, and the tibiotalar joint is the ankle joint between the tibia and talus. Ligaments specific to those joints stabilize those articulations, not the interosseous talocalcaneal ligament.