Which tarsal bone articulates with the tibia and fibula?
**Core Concept**
The tarsal bones are a group of seven bones in the foot that form the hindfoot, midfoot, and forefoot. Each tarsal bone has a unique set of articulations with other bones in the foot and leg, allowing for a wide range of motion and support.
**Why the Correct Answer is Right**
The calcaneus (heel bone) is the largest and most posterior of the tarsal bones. It articulates with the talus bone above it and the cuboid and navicular bones below it. The calcaneus also has a unique articulation with the tibia and fibula bones of the leg through the subtalar joint. This joint allows for inversion and eversion of the foot, which is essential for balance and movement.
**Why Each Wrong Option is Incorrect**
**Option A:** The talus bone is a separate tarsal bone that articulates with the tibia and fibula, but it is not the correct answer because it does not articulate with the calcaneus.
**Option B:** The cuboid bone is a midtarsal bone that articulates with the calcaneus, navicular, and cuneiform bones, but it does not articulate with the tibia and fibula.
**Option C:** The navicular bone is a midtarsal bone that articulates with the talus, calcaneus, and cuneiform bones, but it does not articulate with the tibia and fibula.
**Clinical Pearl / High-Yield Fact**
The subtalar joint, which is formed by the articulation between the calcaneus and the tibia and fibula, is a key site of injury in ankle sprains. Understanding the anatomy of this joint is essential for diagnosing and treating ankle injuries.
**Correct Answer:** C. Calcaneus.