The tarsal bone that articulates with the tibia and fibula is the talus.
The talus is situated above the calcaneus (heel bone) and below the tibia and fibula. It is a critical component of the ankle joint because it allows for the connection between the leg and the foot. One of its key functions is to transmit weight from the body to the foot, enabling a range of movements such as walking, running, and jumping.
The superior surface of the talus has a smooth articular surface, which is shaped to fit with the lower ends of the tibia and fibula, forming the ankle joint (also known as the talocrural joint). This joint allows for dorsiflexion and plantarflexion of the foot. Understanding the role of the talus in the ankle’s anatomy can help in diagnosing and treating various foot and ankle disorders.