The interosseous talocalcaneal ligament primarily limits which motion?

The interosseous talocalcaneal ligament primarily limits which motion?

• A. Inversion
• B. Dorsiflexion
• C. Eversion
• D. Plantarflexion

Answer: (C)

The interosseous talocalcaneal ligament sits inside the tarsal sinus between the talus and calcaneus and acts as a primary stabilizer for the subtalar joint in the transverse plane. Its main job is to keep the talus and calcaneus from moving apart as the hindfoot everts. When the foot everts, the two bones tend to separate and rotate relative to each other, and this ligament becomes taut, restricting that motion. Dorsiflexion and plantarflexion are motions of the ankle joint itself and are governed by other structures, not this subtalar ligament. Inversion involves other subtalar ligaments and bony mechanics, but the interosseous talocalcaneal ligament’s strongest restraint is against eversion. So the best answer is eversion.

The interosseous talocalcaneal ligament sits inside the tarsal sinus between the talus and calcaneus and acts as a primary stabilizer for the subtalar joint in the transverse plane. Its main job is to keep the talus and calcaneus from moving apart as the hindfoot everts. When the foot everts, the two bones tend to separate and rotate relative to each other, and this ligament becomes taut, restricting that motion. Dorsiflexion and plantarflexion are motions of the ankle joint itself and are governed by other structures, not this subtalar ligament. Inversion involves other subtalar ligaments and bony mechanics, but the interosseous talocalcaneal ligament’s strongest restraint is against eversion. So the best answer is eversion.