Which joint is referred to as the "true ankle joint"?

The term "true ankle joint" specifically refers to the talocrural joint. This joint is located at the lower extremity and is formed by the articulation of the tibia, fibula, and talus bones. It plays a crucial role in movements such as dorsiflexion and plantarflexion, which are essential for activities like walking, running, and jumping. The talocrural joint's primary function and anatomical configuration categorize it as the main joint responsible for movements of the ankle, thus earning the designation of the "true ankle joint."

The other joints mentioned play important roles in the overall function of the foot and ankle, but they do not fulfill the same primary role as the talocrural joint. The subtalar joint, for instance, allows for inversion and eversion of the foot but is not technically the primary joint for ankle movement. The interphalangeal joints pertain to the toes and are not involved in ankle motion, and while the fibulotalar joint is a phrase that might refer to parts of the talocrural joint, it does not catch the full function and significance attributed to the talocrural joint itself as the "true ankle joint."