Final answer:
The talus is the only ankle bone that articulates with the tibia, playing a crucial role in the talocrural joint and the transfer of body weight from the leg to the foot.
Step-by-step explanation:
The only bone of the ankle that articulates with the tibia is the talus. This tarsal bone interacts with the tibia to form part of the talocrural joint, which is critical in the movement and stability of the ankle. The upper surface of the talus has a square shape and provides an articulation point with the distal end of the tibia; it is thus responsible for transferring the body weight from the leg to the foot. Additionally, the talus articulates inferiorly with the calcaneus and anteriorly with the navicular bone, playing a key role in maintaining the structure and function of the foot.