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The main function of the Deltoid ligament is to support the ankle joint. This ligament is a strong, triangular complex located on the medial side of the ankle and serves to stabilize the ankle during movement. Its structure consists of several bands that connect the tibia to multiple bones in the foot, providing both stability and support during activities that involve weight-bearing and movement of the ankle.

While limiting ankle inversion is an important function of lateral ligaments of the ankle, the Deltoid ligament primarily acts to prevent excessive movement and maintain the integrity of the medial ankle structure. Its role in supporting the ankle joint ensures that it can withstand forces during activities such as walking, running, and jumping, which is essential for preventing injuries like sprains.

The stabilization of the subtalar joint and assisting in plantarflexion are not primary functions associated with the Deltoid ligament. The subtalar joint has its own set of stabilizing ligaments, and plantarflexion is primarily facilitated by the muscles of the lower leg rather than ligamentous support.