What bones form the subtalar joint?

The subtalar joint is primarily formed by the talus and the calcaneus bones. This joint is crucial for enabling the complex movements of the foot, particularly inversion and eversion, which are essential for walking and maintaining balance on uneven surfaces.

The talus is a key bone that sits above the calcaneus and acts as the connection point for the ankle joint as well. The articulation between the talus and the calcaneus allows for a range of motion and is integral to the function of the foot overall. The stability and dynamic movement provided by the subtalar joint are critical in providing adaptability and mobility for various activities, such as running, jumping, and changing directions.

In the context of the other options, the talus and fibula form the ankle joint rather than the subtalar joint, while the calcaneus and cuboid are involved in the midfoot but do not directly contribute to the subtalar joint. Similarly, the navicular and talus articulate at the talonavicular joint, which is part of the midfoot, not the subtalar joint. Hence, the correct answer accurately reflects the bones involved in forming the subtalar joint's functional anatomy.