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In a radiograph of the foot, which joint is indicated by the arrow?

Subtalar

Talocrural

The image is pointing to the ankle mortise, where the distal tibia and fibula form a joint with the talus. This is the talocrural joint, the true ankle joint, responsible for dorsiflexion and plantarflexion. The subtalar joint lies between the talus and calcaneus just below, the tibiofibular joint is the distal tibiofibular articulation higher up between the two bones, and the midtarsal joints are in the midfoot between the talus/navicular and calcaneus/cuboid. So the arrow indicates the talocrural joint.

Tibiofibular

Midtarsal